This is good but i hope it's really mature, last week i tried enable it on Hogwarts legacy with my Rx 6700xt and the game crashed instantly. I'm on Mesa 23.1, i will test again when 23.2 will release
I think the devs are still working on the release of 23.2.
We probably see it in october / november.
Once it releases the availability depends solely on your distro.
If you are on a fast updating / rolling distro such as tumbleweed or arch you'll get the new packages very quickly (usually days / a week after release)
It's already in Mesa's 'stable' because it's in a release. Whether it's in a distro's stable is up to the distro. For e.g. Fedora, it should be pretty quick. For something like Debian, it may take a long time.