Yes.

If water still beads up on the leaflets (they still have a coating of horticultural oil, like wax on your car), you can wait a couple of weeks.

Thanks! :)

What is the Cornell Formula and where can I get more information on it?

Here is my website with a complete (or almost complete) discussion of rose culture. For the Cornell formula, scroll down to Spraying & Fertilizing.

Here is a link that might be useful: Rose Care & Cultivation