Prior to Covid, for your time frame, Saguaro would have no available full hookup sites. You would have a boondock site available for a couple of days until a full hookup site opened up. I don't recall anyone waiting more than 3 to 4 days.
Hard to predict what this season will bring. Our Annual Meeting is Feb 3, so probably around that time we will be full. But again a site will open up within a couple of days.
Calling about a week before you plan to arrive will get you a better idea about how things look for your expected arrival date.
Dave