You do not get your room number until check-in day when it is available in inventory.
Online check-in just allows you to place a cc. On file and place a time of arrival. There will be a separate check-in line, your packet will be ready, and your room may be ready. If it is not to your liking, you may reiterate your requests, state you will wait for a room and they may or may not be able to comply depending on how busy the resort is that day.
Room requests are not guaranteed. They are merely requests.