Matterhorn standby will be >45 min most of the day. Do it first thing or late in the evening. I didn't see when you are visiting. If PTN is happening, that is another good time to ride the Matterhorn.
Small World - Standby is usually <45 min but can get longer than 45 min throughout the day. Keep your eye on the app for shorter wait times. If you are visiting during the holiday overlay, wait times are almost always on the longer side.
Guardians is rarely less than 45 min.
Webslingers is usually long as well.
Monsters Inc has a buddy pass line. Ask the CM at the front for a buddy pass. You will need to divide into groups of two, but the wait will be <20min.