Hey guys. New to golf. New here. I have a basic question...in applying the "pronate/supinate" wrist approach.

Please stop me if I'm mistaken. As I understand it. On the downswing, your right wrist stays pronated (palm up) and then supinates (palm down) through impact?

WHEN does this change happen?
-Just after impact?
-Just before impact?

I'm confused. Its too hard to see this in observance of the pros, as it happens too fast. Thanks for any help.