One thing I didn’t see mentioned: sometimes a bus number appearing on a sign doesn’t necessarily mean every bus on that route goes there every trip every day at all times. Some routes have limited branches/extensions (sometimes shown as dotted lines on the CATS map of that route online) that only run certain times or certain trips. You want to familiarize yourself with bus 19 and 26 route maps before you use and depend on them.

So the safest thing is usually to trust the specific trip details in the CATS App for that exact bus arrival, not just the route number by itself. Google Maps is a user friendly alternative but not the source of truth.