Please, add some kind of indication and progress meter for headless mode execution.
You can currently see the progress of a headless execution in cmd window but if you close the window, the execution continues in the background. And you could never tell by looking only at the Katalon Studio at that moment.
This is also a problem when you have remote or scheduled execution - you are able to tell something is happening only when the test report arrives. And if something goes wrong, no one knows.