I’m not a Nvidia user, but I think you can find a good summary here, at the end of the first post, talking about optimus-manager.
But I also remember many times the suggestion to use prime-run, e.g. see
Of course the drivers will be updated with the usual garuda-update.
The games, I guess, would generally run better with the Nvidia GPU, but this could be checked just trying, and searching in the forum and on the internet.