is there anything I should do while the bee's are still in winter mode
JUst wait. You cannot do any usefull.
My hives have cleansing flight during 2 weeks. After that I check food, I change bottom boards and I put terrarium heaters on bottoms.
In first week of April I start pollen patty feeding. Snow cover goes away about 10.4. and willow starts blooming 1.5.