Depends on the specific distro and their upgrades policies.

Usually with normal distributions you get an update to a new major version (e.g. from Plasma 6.0 to Plasma 6.1, or some versions can be skipped) when a new version of the distribution gets released, and in the mean time you only get bug fix releases (e.g. 6.0.x to 6.0.y). Sometimes some distributions also make special backports available to bring new major versions to same distro version.

With rolling release distributions (e.g. openSUSE Tumbleweed) you get new major releases in a few days after they are released.

So you need to check with Nobara how they handle this.

No thanks. We don’t need more closed and bloated spyware, what we need is more open and privacy respecing OSes like GNU/Linux and devices using it like Steam Deck.