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The best time to move iris is six to eight weeks after they bloom. Division and transplanting can be done at the same time. I would try to flag them now with some type of marking system while in bloom so that you know what you are moving later.
As the leaves slowly die back and turn yellow, they return nutrients to the rhizome. Cutting back iris leaves before they turn yellow deprives the rhizome of important nutrients, which means the iris will not grow as well come the spring. Nutrient-rich rhizomes, on the other hand, will not only produce large, beautiful blooms, but will also spread quickly to form large clumps of showy irises.