what kind of grapes: table, wine?
wine grapes if managed in a Napa/sonoma style will have non fruited shoots pinched off about now. to balance the energy of the grape vine and the fruit.
if the vines are trellised, in grape vineyards they would be topped soon, but not necessary.
if grown more similiar to comercial grapes, no pruning is done. ie central valley of california for Gallo, etc.