My experience is that the line fluctuates throughout the day so I don't know that there is a real pattern to it. Throughout the day you have a combination of guests leaving their luggage as they arrive and also those leaving it for luggage services to hold if their flight is later in the day. At the same time, you have guests picking up who left their luggage there earlier in the day, either to take to their room or home.
If you're asking about your arrival day, I think your best option is to check the line when you arrive and make a decision in the moment. There is no guarantee what time a room will be ready. It may be within an hour of your arrival or, several hours may elapse. The additional cleaning that is being done right now means increased time required between guests leaving and the room being prepared for new guests.