I wouldn’t wait to get it checked. A belt that noisy is probably on its last revolutions.
Db, I personally would prefer to be able to adjust the tension myself. Retracting my tensioner to change the serp belt is to me more difficult. In the old days it just required loosening the alternator, sliding it over, removing and replacing the belt, and sliding the alternator back until the belt tension is good and tightening the retaining bolts up. On my tensioner, I have to have my neighbor hold the tensioner back while I put the new belt on and thread it around everything. IMHO the old way was easier.