Found a nanner in one of my buds. Should I cut right away and don't wait the last 5/7 days?

few bananas inside the bud near the end of flowering is something pretty common and you don't necessecarely need to worry about it. You did the right thing removing it, but even if you didn't it prolly won't had enough time to get mature and drop some pollen before you harvest, even tho such bananas get mature and drop some pollen the plant won't have time to produce mature seeds and the trichromes maturation is advanced enough so it won't impact your harvest potencey in any significant way. there no valid reason to change your plan for harvest.