I agree, too hot right now to prune, otoh, where are you? It is a good idea to post your zone, or the state you live in. Pruning generally spurs a plant to want to put on new growth, which is too hot right to do well. Pruning things too close to winter-late fall is a bad idea too because then new growth can be frost damaged, the plant tries to put on new growth, when it should be going dormant. I would say spring is the best time to hard prune a rose, but now that the ivy is away, it may grow out some nice stuff. I'd just give it a good dose of water and put some mulch around it for now like Elaine suggested. Zuzu is right, the roses will probably fill in nicely and not need any pruning, just cut off anything that is obviously dead. If you are not sure, don't cut it, because roses can kinda look dead sometimes and make a comeback.
