Assuming that stanley milgram’s obedience study was not ethical by today’s standards, at what point in the procedures established to ensure appropriate ethics would his study have been discontinued?

As soon as the IRB had received his study and reviewed the entirety of it, they would likely not give the go-ahead to begin the study. With the fact that deception and threat of harm were overriding principles and were not made clear to the participants administering the punishments, it would have been easily apparent that the study would have violated IRB principles.

It would be around the egyptian area.