You have to do a BIOS update to use the last 5000 CPUs. but it is very easy to do.

I also ordered the MB today. I hope it arrives tomorrow, all the other parts are already there! About the question: Yes, there is a bios update for the Ryzen 5000 series on the Asus homepage. The latest bios update is from 09-02-2021. You can find instructions everywhere on the net ;).
Let me know if you succeeded with the update. I have to flash it too. LG

Are BIOS updates currently available for the Ryzen 7 5800x?

Yes, but I mean, is the motherboard BIOS update for the 5000 series already available?