I would transplant now, unless the weather is very hot where you are. Dig it up and have your new hole ready so it is not out of the soil long. Trim it down a bit before moving (especially if it is very big), and you might shade it from the direct sun for a day or two.

I read something on the Antique Rose site that said recent research said moving a rose is very hazardous. They recommended potting as an intermediate step. Then plant it after it has recovered. It seems the shock of transplanting puts an extra strain on the roots that need oxygen and if moved immediatly are apt to suffer. I've had several die and thought it was just the soil in my other bed that is not the greatest.

The other suggestion was heeling it in, not sure exactly what that is, so the roots can recover but I think it means covering the roots with soil so they don't dry out but leaving it unplanted for a time. With less soil on them maybe they get the oxygen they need. How long I don't remember if it said.

I was just thinking myself of a rose I would like to move. And I've never satisfied myself as to when it is a good time to move a rose. Supposedly when it is dormant but that could in a cold place like here be before the ground is thawed. Or it is still too wet. And anytime later like your situation seems to be interrupting the life cycle. I have done the container thing then planted which seemed to work.