Referindo-se ao exemplo da Microsoft: [ https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.process.enableraisingevents?view=netframework-4.8]
O melhor seria definir:
myProcess.EnableRaisingEvents = true;
Caso contrário, o Código será bloqueado. Também não são necessárias propriedades adicionais.
// Start a process and raise an event when done.
myProcess.StartInfo.FileName = fileName;
// Allows to raise event when the process is finished
myProcess.EnableRaisingEvents = true;
// Eventhandler wich fires when exited
myProcess.Exited += new EventHandler(myProcess_Exited);
// Starts the process
myProcess.Start();
// Handle Exited event and display process information.
private void myProcess_Exited(object sender, System.EventArgs e)
{
Console.WriteLine(
$"Exit time : {myProcess.ExitTime}\n" +
$"Exit code : {myProcess.ExitCode}\n" +
$"Elapsed time : {elapsedTime}");
}