Mine were coming in very heavy with nectar the other day, but I also have some sugar on the hive -- learned a few years ago that they can starve out even this late when we get sudden cold weather.
Too cold to feed syrup most days, so I dumped dry sugar on newspaper over the cluster. They seem to have gone through most of it, will check this weekend when it warms up.
It won't be long before they are hauling huge amounts of nectar in, but feed if they are light!
Peter