How to connect to Wifi from maintenance mode

My Clear Linux won’t boot all the way due to a Nvidia driver issue, but I can get into maintenance mode. However, I don’t have an internet connection in maintenance mode.

How can I connect to my Wifi router while in maintenance mode?

If internet isn’t possible, how do I download the swupd packages on another computer, put them on a USB and make them available to the broken computer in maintenance mode?

nmcli should allow you to configure wifi from the command line. Please refer to its man pages and online documentation on how to use it.