If your overwintered colony is strong, it is time to do a reversal.
Move the bottom box to the top.
The reason we do reversals, is to get the queen to lay eggs throughout the whole hive. This also makes the bees put pollen and nectar in all the hive boxes.
Now when you check your overwintered hive on a weekly schedule, and if there are eggs in the top box, do a reversal. This will expand the brood nest an the hive will get more bees in the hive. This is the goal as we approach dividing time around early to mid May.
Do not do any more reversals after June 10th.