Jack n Rod have given you a lot of food for thought in there notes. I have a couple questions too. First, is this your first season n where do you live ?
If you live in the Nortnern Hemisphere usually you should be using two double deep boxes before (that are full of drawn comb, bees n resources (nectar/pollen/honey))) … And if so is there currently a massive or great local nectar flow… if so n your lower two boxes are stuff (80%plus) … and you’ve prepped the flow-frames with wax (as noted) then just maybe you might have a concern.
If most of this is a “No” answer… patience Lee … it’s not the end of the world with your bees … Don’t get the cart ahead of the horse, as my mom use to say.
Until the season, condition n bees are really ready you won’t find much happening upstairs in any honey supers…
Sounds like your doing okay. Some info in your profile n in your notes helps us help you as well. A pix or two are worth a bunch of words too.
Please keep the questions coming. Observing n asking questions will get you a lot of mileage in Beekeeping too. Find a local bee club n mentor if possible to know what is normal for your local region.
Good luck ,