If, after mid-September the hives are still in the same condition then feeding them would be called for so that they can finish drawing combs and building stores.
There should still be another small flow between now and then so not all is lost. They still have time to get-r-done.
I would not recommend over wintering with less than the equivalent of 1 full deep plus 1 full medium, regardless of your location within the 50 states.