I do not consider myself very knowledgeable on plum & peach matters, but will take a stab at this, seeing you question isn't answered after one day's wait.
No, I wouldn't prune them now. It might promote new unwanted growth now. Secondly they wouldn't heal over the wound, thus leaving the wood unprotected and exposed until next summer. Also removing the branches would remove leaves needed to help build up energy for the root system needed next spring.
I find summer pruning is great for keeping plants small since it shrinks the current supply of leaves (which then cannot work to store food for the winter). In winter pruning, the plant already has stored food and after pruning a plant, it springs forth with loads of new growth when the weather warms. That is fine when I am trying to invigorate a tree but not good at all if I am trying to keep it small--around 7 feet or less.
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