https://wccftech.com/download-macos-mojave-wallpapers/

You can now download the new macOS Mojave wallpapers for your Mac, PC, phone or tablet. All wallpapers are 5K in size.

Unlike iOS 12, Apple was a little generous on the wallpaper front with macOS Mojave. It includes two new backdrops from the Mojave desert – one photos is taken in broad daylight whereas the other one is taken at night to show off the new dark mode of macOS 10.14.