How big is your Wisteria? If massive, you could partially prune it, but obviously any pruning now will mean you will lose the buds and therefore this years flowers.

Hi we have wisteria all over the front of both our home & our gite,
Wisteria w should be showing signs of the buds opening to show leaves from now,

I prune my wisteria after its finished flowering and as soon as,
by doing this i get a second showing in september,

So if you just leave yours to flower and then after the flowers have gone do as i do and the roots will put all its energy into a second showing,
so wait and let if do its thing first.