what package should I install for these cpu information?
Yes! Thank you
Im using latest Snapshot firmware (no stable yet)
Should I download for OpenWrt >= 21.02
Or OpenWrt 19.07?
The less incorrect is the 21.02 obviously but none are correct, ask on GitHub to him if it works fine also on 22.03.
it can harm my router if the version is incorrect?
I don't know, ask him on github.