Some of my Sun Gold cherry tomatoes and my blueberry-sized Matt's Wild Cherry tomatoes are now ripe. But I would like to use more than 3 or 4 at a time, and it looks like that's how they are ripening...3 or 4 at a time. May I leave the ripe ones on the stem for a certain length of time? Or, must I pick them now and store in a hanging basket? Thanks for any tips!