At some point, usually around the third year, the rose puts up a strong basal break. This looks like a real basal, and not like the twiggy juvenile growth. When it has maybe 3 or 4 of those, the twiggy growth can start to be removed.

If they are still in pots, I hope they are fairly large pots.

Diane, leave them be. Just clip off anything dead. otherwise, wait for the more substantial growth that MG mentioned.

Thank you both for your advice! I'll leave them be until I see those basal breaks. A few are in good-sized pots, most are in the garden beds.