You can stay offline forever if you wish, but for security patches, software downloads, and driver updates, eventually you will want internet.
When you get back to the "Let's connect you to a network" screen, look closely. You will now see a new option: "I don't have internet." Click it.
🖥️ Install Windows Without Internet
: If you're installing Windows on a new hard drive or you're reinstalling it, make sure to back up any important data you have. This process will erase all data on the selected drive.