Pollen coming in means that there is pollen out there!
When you get a half-decent day, open up and check for the presence in appropriate quantity of stores, space and brood. Not a full inspection - you ought not even need to lift out the brood frames. No need to find HMQ, look for eggs, admire the brood pattern, etc. Minimal disruption, maximum reassurance.
Mainly check they aren't about to run out of food. As the colony expands, its rate of eating increases, and that is ideally just ahead of new forage availability. So the last scraps of stores could vanish surprisingly fast.
On the other hand, you don't want them to have so much stores that it restricts HMQ's space to lay eggs.
Food and space are about the only things you can do anything about at this time of year.
So they are the prime things you need to be checking when you open up.
If everything is all right, swiftly install your see-through top cover, and let them get on with things.
As a hobby beekeeper, you can afford the time and care to have a 'first look', when the weather gives you an opportunity, somewhat earlier than a large-scale keeper could schedule a proper "first inspection".
Carpe diem!
