I tend to give it a week or two unless there is an issue being address that has been problematic for me.
At this point I don't think I have seen any problems with D7000 v1.1 firmware, so it should be safe to move ahead.
Follow the steps explicitly. Be sur eyou have a fresh battery. Update A first then update B separately - essentially repeating the steps. They cannot be copied to hte card and updated at the same time.