With the Fed extreme eastern grip the wrist is somewhat laid on most shots, very laid back on inside balls, and closer to neutral or neutral on wide balls, particularly hit crosscourt.
The vast majority have some degree of lay back.
Although it is commonly believed that there is a stretch shorten cycle here that generates power, from what I understand from Brian Gordon, that is a misconception.
The wrist is loose and naturally comes somewhat forward with the swing. It is also used to make the small adjustments that control shot direction.
It's not active contraction to contribute to the stroke. Really it tends to take care of itself if the right elements are in place technically and there is a tendency with some players to micro focus on the wrist when larger issues are more critical to improvement.