Plasma 6 landed in opensuse. However, I recommend to do it in tty because if you do it in plasma the upgrade will be incomplete because the shell will crash in the middle of update without installing all. In case this happen to anyone, just reinstall plasma 6 pattern and it will go without problems
Upgraded this morning. Everything seems mostly OK, but the login screen theme is odd, but fully functional. The lock screen is the same as before, though.