Having spent time in medical on the Jewel a couple of weeks ago, I can tell you testing or not, COVID is prevalent on the ships. Several crew members had it.
If you were lucky enough not to get omicron this year and cruise or go through a few airports this summer, you are probably at a pretty high risk of getting COVID. My brother and his wife fell into that category on our cruise. My wife and I had omicron this year, so we were not too worried about it. Fortunately, with the vaccines and current treatments, it isn’t the same health risk it was 2 years ago.