easiest way i confirm it is if the character sprite stay standing. you cant block if you aren’t crouching.
standing, footsie, punishment and counter hit are (for 90%) will hit situations. Standing because as Jonny said, they can’t block it. Footsie, because you should be hitting one of his pokes or dashes. Punishment speaks for itself. CH is the only case where there appears to be a true hitconfirm(but I haven’t been able to confirm this myself). The players seem to ‘pause’ during CH, allowing you enough time to confirm into super.
It’s worth mentioning that all c.MK XX SA3s from Kens during Coop Cup 4 are all either one of the above cases. Meaning that none of them were actually true hitconfirms.