Checking for Nvidia Web Driver updates
This is mostly a self-serving post so I don’t have to spend a half hour tracking it down next time, but the URL for the Nvidia Web Driver .plist is https://gfe.nvidia.com/mac-update.
If you need the Web Driver (most likely because you have a fancy graphics card in an old Mac Pro) you can just check that to find the latest/beta version, and determine when an update is available following macOS point updates. For whatever reason, this URL is near impossible to find - there’s reasonably up to date posts on hackintosh forums when a new version is posted, but if you don’t want to wait for them to notice, you can just check it yourself.