It's always OK to trim out dead branches and "deadhead" spent rose blooms. This helps the appearance of the plant and also keeps decay organism from getting a toehold on an otherwise sturdy plant.
My rose-pruning "window" is three weeks in January; sometimes as late as the first week of February.
For three Januaries in a row (2006, 2007, 2008), I had such a difficult January that the roses weren't truly pruned at all.
So, if you can get to them next year, that'll be great. In the meantime, your inability to prune them this year has affected their appearance, not their health.
Sunset Zone 17, USDA Zone 9