The Quest devices are all fully wireless and have a pretty decent existing library of Quest-specific games and apps that you can play even if you don't own a computer.

You could also connect them to a PC wirelessly and play any PC VR games that your computer is capable of running. It used to be a little more cumbersome to set up, but Valve recently released a native SteamLink app on the Quest store that vastly simplifies the whole PC VR experience.