Read through my guide
The upgrade view (https://www.ajtek.ca/wsus/how-to-setup-manage-and-maintain-wsus-part-2-computer-groups-update-views/) will show you what upgrades are available, and you can use the scoping of the Approvals process (https://www.ajtek.ca/wsus/how-to-setup-manage-and-maintain-wsus-part-6-selecting-your-test-systems-the-approvals-process/) to find the ones that are applicable to your systems.
Upgrading through WSUS is as easy as approving the 'correct' package that the computer's indicate that they 'need' and then sitting back, relaxing and watching the systems upgrade (or move onto other things).