Existe uma maneira no QGIS 3 de obter um recurso selecionado WKT?

No QGIS 2.x, usei o plug-in getWkt : https://github.com/hugoledoux/QGIS-getWKT para obter um WKT de um recurso selecionado.

Mas esse plug-in não está presente no QGIS 3.x. Esse recurso foi incorporado ao QGIS 3 principal? Ou é este o caso em que estamos aguardando o plugin recuperar o atraso?

Não tenho certeza se isso realmente fazia parte do QGIS 2.x, pois sempre usei o plug-in getWKT. Mas o WKT pode ser acessado no menu de contexto da janela Identify:

Resultado:

wkt_geom    id  OBJECTID    ID_0    ISO NAME_0  ID_1    NAME_1  ID_2    NAME_2  HASC_2  CCN_2   CCA_2   TYPE_2  ENGTYPE_2   NL_NAME_2   VARNAME_2   Shape_Length    Shape_Area
MultiPolygon (((-86.1056060791015625 34.20109939575195313, -86.10605621337890625 34.22154998779296875, -86.10604095458984375 34.22610092163091622, -86.10703277587890625 34.25019073486328125, -86.10832214355457381 34.32471084594732247, -86.10830688476556816 34.32788848876958809, -86.1097869873046875 34.36470031738286934, -86.10974121093744316 34.37469863891607247, -86.11003112792963066 34.42784881591802559, -86.05683135986328125 34.47628021240240059, -86.04846954345703125 34.47669982910167619, -86.03733062744134941 34.47574996948242188, -86.03174591064453125 34.47526931762706681, -86.02672576904296875 34.47661209106456681, -86.02169036865228691 34.48067855834960938, -86.0177764892578125 34.48247909545904122, -86.01275634765619316 34.48200988769536934, -86.00663757324213066 34.48107147216808244, -86.00216674804681816 34.48196029663097306, -85.99098205566400566 34.48736953735351563, -85.98596954345703125 34.48688888549816056, -85.9837188720703125 34.490509033203125, -85.97757720947265625 34.49139022827148438, -85.96972656249994316 34.4968109130859375, -85.96190643310541191 34.49950027465831681, -85.95966339111328125 34.50222015380865059, -85.9568328857421875 34.507659912109375, -85.9383087158203125 34.52527999877924003, -85.9231719970703125 34.53520965576177559, -85.91980743408203125 34.53701019287103691, -85.91082763671875 34.54423141479492188, -85.881683349609375 34.5622406005859375, -85.86540985107416191 34.57260894775396309, -85.839019775390625 34.5897216796875, -85.8244171142578125 34.59962844848644181, -85.81993103027332381 34.60187911987310372, -85.81488037109375 34.60548019409185372, -85.81262969970703125 34.60683059692388497, -85.78566741943353691 34.62438201904296875, -85.76193237304681816 34.65375900268560372, -85.73532867431634941 34.68856048583990059, -85.733062744140625 34.69173049926763497, -85.72173309326171875 34.70664978027349434, -85.71833801269525566 34.7102508544921875, -85.69338226318359375 34.74415206909185372, -85.67267608642572441 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34.51490020751953125, -85.53459930419921875 34.51354980468744316, -85.535186767578125 34.51082992553710938, -85.5408172607421875 34.50632858276372872, -85.54480743408203125 34.50001144409185372, -85.5475921630859375 34.500030517578125, -85.5509033203125 34.50323867797857247, -85.55480194091791191 34.50371932983409806, -85.55871582031238631 34.50239181518549003, -85.55771636962890625 34.49238967895513497, -85.559417724609375 34.49058914184570313, -85.56835174560535506 34.48974990844737931, -85.57063293457025566 34.4861297607421875, -85.5767822265625 34.48390960693365059, -85.57459259033203125 34.48070907592773438, -85.57350158691394881 34.47888946533203125, -85.57071685791009941 34.47795867919927559, -85.5702972412109375 34.46704864501953125, -85.57639312744140625 34.47072982788080253, -85.5808563232421875 34.46986007690435372, -85.577606201171875 34.46165847778325997, -85.57930755615228691 34.45940017700200997, -85.58377075195306816 34.45851898193365059, -85.57946014404296875 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34.37211990356439628, -85.635498046875 34.36804962158203125, -85.63662719726556816 34.36669921875, -85.64108276367181816 34.366729736328125, -85.64272308349603691 34.36946868896490059, -85.6449432373046875 34.36994171142578125, -85.64778900146473006 34.36405181884765625, -85.66282653808588066 34.36280059814458809, -85.6684417724609375 34.35874938964849434, -85.66848754882801131 34.35466003417980119, -85.67241668701171875 34.35150909423833809, -85.676361083984375 34.34698867797851563, -85.67472076416015625 34.34379959106450997, -85.67865753173822441 34.34019088745122872, -85.77178192138671875 34.26084136962890625, -85.7779083251953125 34.25905990600585938, -85.80847930908197441 34.25923919677740059, -85.80921173095697441 34.23971176147472306, -85.81086730957019881 34.23971939086925431, -85.81755828857421875 34.23884963989257813, -85.8253173828125 34.24071884155273438, -85.83030700683588066 34.24164962768566056, -85.8436279296875 34.24444961547857247, -85.84343719482421875 34.19992065429693184, -86.01341247558588066 34.19984054565441056, -86.02507781982421875 34.19989013671880684, -86.04508209228509941 34.19997024536138497, -86.06896209716796875 34.20051956176757813, -86.09284210205072441 34.20059967041015625, -86.10173034667963066 34.20109176635742188, -86.1056060791015625 34.20109939575195313)))  25  25  244 USA United States   1   Alabama 25  De Kalb US.AL.DA    0       County  County          2.16771912642183    0.197712887515082

Atualização:
O comportamento do recurso de cópia pode ser modificado no Options | Data Sources | Feature attributes and table | Copy features as:

Portanto, se estiver definido como GeoJson ou sem geometria, você precisará usar uma opção secundária para obter o WKT (consulte outras respostas a esta pergunta).

Não tenho certeza se isso atende às suas necessidades, mas você pode (e sempre pode) obter o WKT da calculadora de campo adicionando uma camada virtual com:

geomToWKT( $geometry )

Você também pode usar o seguinte no Python Console (embora seu método seja mais rápido):

layer = iface.activeLayer()
for feat in layer.selectedFeatures():
    print(feat.geometry().asWkt())

Com alguns recursos selecionados, você pode simplesmente copiar os recursos usando o botão Copiar ou Ctrl + c.

Em seguida, você pode colar em uma planilha ou bloco de notas. A coluna de geometria será representada no WKT.

Existem várias maneiras de obter o WKT, como criar um campo (virtual ou não) com a expressão mencionada anteriormente.

Mas, para a sua pergunta original sobre o QuickWKT, este plugin foi portado para o QGIS 3. Verifique o gerenciador de plugins.