When you stop Wildfly, this message will appear almost immediately:
D:\Infogix\v9.4\Infogix\bin>stop-wildfly.bat -c IA IA
"outcome" => "success",
"result" => undefined
This message does not mean that the product has shut down successfully yet. It means that it has successfully started the shut down process. You will need to check your Wildfly server log to see when the shut down has actually completed.