I am not splitting yet. I'm gonna give it a couple more weeks. This spring continues to be strange.
I have seen a very wide range in my hives. In some hives, they have 15 frames of brood, and drones that have already emerged. In others, they are just coming out of winter with a few conservative frames of brood. If you split now, you will likely get a properly mated queen. There does seem to be enough capped drones, who will be ready by the time your queen is. But, there isn't any flow to speak of. Most hives are bringing in plentiful pollen, but still living off the honey they have stored. I like a good flow and to be sure that all the hives are in full buildup mode, especially if you are letting the split make the new queen. You wanna be sure the hive making the queen is strong with abundant resources and young bees.
We did graft queens last week, though, and used the strongest hives as finishers. These hives are packed with bees and brood and were already showing the very beginnings of swarm tendencies and will raise great queens. This will allow me to use these strong hives to make the make nucs in a couple weeks that will be well equipped to gets these ladies mated. It was interesting that even in the strong hives the young larvae were somewhat dry, showing the flow isn't on. But, feeding the swarm box and finishers will get great results.
TLDR: I don't recommend making splits just yet but as always, listen to the bees since every hive is different. If you want to do some extra manipulations with strong hives, I expect you can get well-mated queens.