Don't worry about the drones the bees will eliminate them when they're ready. The time varies from hive to hive. Some hives maybe doing it now, especially if dearth conditions exist, while other hives may wait for a month or more before killing of the freeloaders. Concentrate on developing the hives and getting them into the best condition you can before winter. This should include dusting w/powdered sugar for mites. You have time for a triple application (once every 10 days) before winter conditions set it. The more you can knock down the varroa mite population now the better it will be for the bees and the better chances of survival until spring.