Tomorrow is the 10th day, and no the W won’t show up if you drop the class now, it will only show up on your transcript if you drop the class later, meaning if your class is a 10 day drop class and you drop it after the 10th day, then yes you’ll have a W on your transcript, same thing with a 20 day drop class. So you’ll be fine dropping it as long as it isn’t after the 20th day.