Well, if you can take anything away from historical context:
21.02 RC1 was tagged on 2021-04-19
It had 4 RCs
Release was tagged 2021-09-01
22.03 RC1 was tagged on 2022-04-20
It had 6 RCs
Release was tagged 2022-09-03
23.05 RC1 was tagged on 2023-06-06
We're on RC2
If history repeats, add 5 months to RC1 tag, then maybe Nov 2023...
Full tag history here: https://git.openwrt.org/?p=openwrt/openwrt.git;a=tags