Bricks, Masonry, Asphalt and Concrete - Control Joints

I just poured a 16' x 21' X 5 1/2" concrete pad to be used as a basketball court for the kids. Its on a good stone base, well compacted. I used 4000 lbs with air and wire mesh. The surface has been sprayed with a curing agent. At present I have it tarped due to dropping temps. The pour was done in 50 degs, the temp at night goes dwn to 35 degs.
When do I need to get the control joints cut in? I have heard anywhere from a 12 hr time frame up to a 36 hour time frame.
Additionally, what else can I do to aid the curing process?

Those temps are right on the edge of pourability, but should not be a problem as the slab itself will generate some heat. I would not wait more than 24 hours or it could start cracking on its own.

It sounds like you have the curing covered.

Thanks much, do I need to leave it covered for a few days with the tarp or should it be ok in the morning?

When faced with those type of questions, I always ask myself, "Will it hurt to continue, or may it possibly help". It won't hurt, for sure.