Wrist hinge should happen naturally in the golf swing. If your grip is in a neutral position, the wrists will be able to fully hinge as you swing the club back to the top. There is no exact spot where you are supposed to hinge your wrists. Some players set their wrists very early in the swing and others create the hinge later in the swing. Most high-handicappers go wrong when they have no wrist hinge and have to end up hinging their elbows instead to get the club to the top.

Place a tee in the butt end of your club.
As you swing back, your wrists should start to hinge so that about three-quarters of the way back your arms and club will form the letter “L.”
The tee should be pointing down to a spot on your target line.
If the tee is still pointing at your belly then you may have to hinge the elbows instead to complete your backswing, losing valuable width and extension.