Both Leap and Mint are based on the Long-Term Support (LTS) model where packages are held back from feature releases for an extended period of time (usually for more than half a year) and only receive security updates. Wayland is a very face moving project with new features (in the form of vote-by-committee designed protocols) coming nearly every month. Nvidia also have their proprietary driver that they maintain at their own pace (often having to catch up with wayland). So if you want to adopt wayland and all the benefits it provides (better multi-display support, HDR + VRR, lower latency and better security standards) you'll have to choose a non-LTS distribution that packages these changes or wait out the LTS cycle.

Nvidia on wayland is tougher than Nvidia on X11 as wayland isn't a /usr/bin/wayland project, it is a set of protocols designed by the Linux community leaders (KDE, GNOME, Valve with Mesa and Gamescope, etc.) so Nvidia has to make sure their drivers work on different compositors. The Nvidia binary blob has decent support with wayland provided you're using GNOME or KDE and you're using the very latest 555 driver or higher, but most LTS distros don't have that driver by default.

I think this LTS cycle (Ubuntu 24.04, Leap 15) is going to be the last LTS where X11 will be a preferred option for users, so you can either wait out this LTS as the last time to use X11 or switch to something like Tumbleweed or Fedora if you want to use wayland.