I just pruned my grapes and my neighbor's grapes yesterday.
While I certainly don't recommend such a practice, it happens
about every 5 years for me. Some winters I'm out of town too
much; other winters I'm just overloaded; this winter I was ill.

Obviously I prefer to prune in very late winter. Amazingly, the
plants are extremely forgiving. I've been growing my own grapes
for over 30 years. The crop seems to suffer a bit from very late
heavy pruning, but other factors are much more detrimental:
Failure to prune at all, irrigation practices, insect attacks; etc.

What you have done should be very safe. Plants are very adept
at healing themselves. Relax and look forward to your harvest.

Good luck,
Gideon