To be fair, most built in wallpapers in macOS do have a day/night version (for example Sonoma), or multiple versions with sunrise/day/sunset/night (Ventura, Monterey, Big sur). Apple does call them Dynamic backgrounds and they will switch automatically during the day.
Also, I hate to do this but if I'm allowed, tinniest plug, I do maintain a screensaver project for macOS that does video both screensaver and wallpaper integration with solar time adaptation : https://aerialscreensaver.github.io (the default download will give you the app that does the wallpaper integration).
Also, I hate to do this but if I'm allowed, tinniest plug, I do maintain a screensaver project for macOS that does video both screensaver and wallpaper integration with solar time adaptation : https://aerialscreensaver.github.io (the default download will give you the app that does the wallpaper integration).