Currently, all I can say is in the summer of 2023. The public beta is still ongoing and a second beta is now out to those who were actively beta testing initially. Now, Engineering needs to assess all that feedback & determine (based on delivering a solid feature set) when they could deliver GA (including a solid Q/A & documentation). So please be patient & stay tuned.
But seriously, I prefer Appeon to take their time on this one. There's a considerable little list of things that don't work well enough in my humble opinion.
Personally, I'd rather see a yearly release with more quality and stability and less new features. Companies are reluctant to immediately adapt a new release that just came out (due to possible bugs and the amount of re-testing required), only to repeat the process half a year later.
I DO understand that lots of features are necessary to modernize PB, but hope it slows down in the future with the gain of stability and quality.