FishNut, ID has a good suggestion, the heft test as he calls it. Lift back of hive to determine, approximate hive weight. If light, keep feeding.
Van
I will add, some hives of mine are young under weight hives whereas established hives in 3 deeps are to full and need to be reduced to two deeps for winter. So I rob honey from one heavy hive and place the capped frames of honey in my light hives. Robin Hood beekeeping as I have 18 hives so this method is doable. I just have to be careful, very careful to avoid robbing.