Which wallets support Bolt12 today?

CLN, soon Eclair, eventually LDK. The specification has been a draft but usable in CLN for years now. They warn you don't tattoo a static BOLT12 QR code yet because the spec could change before final.

None that I knew off. 😞 Afaict, you need a CLN node with some 'experimental' feature on. Eclair and LDK also working to support it, but nothing standardized or finalized yet.

They're collaborating on improving the specification and working on interoperable implementations. That's how open protocols should work. There's really only one entity that isn't cooperating in that way.