It looks like groundwork for USB support is here: https://patchwork.kernel.org/project/linux-…[email protected]/ and that series has been merged for Linux 6.19.y which we will bump LE13 nightlies too in the next month (once it ships) but looking at https://github.com/morrownr/rtw89 quickly I don't see obvious patches for RTW8922AU that could be simply picked on-top to add support, but if that codebase works then I'd be reasonably confident of support coming in the next couple of kernel cycles as the developers working there are quite active and constantly chipping away at upstreaming.
For the rtw88 driver we intentionally disabled the incomplete in-kernel driver in favour of using the lwfinger/rtw88 dev branches for a while, but that allowed us to drop older Realtek vendor drivers at the same time, so the additional hassle of regular bumps to keep track of development was acceptable. I'm not sure we want to repeat that for rtw89, but if you can build an LE images and look at git history to see how rtw88 was handled it shouldn't be too hard to add support.