If you're planning on curing that rock in the tank then you need to get it up and running. Water, SG
checked, powerhead(s), heater, etc. The 'live' rock you paid a premium for needs to be kept wet (with salt water) preferably submerged at all times or else you'll end up with all base rock.
If you are going to cure it outside of the tank (in tubs) then you need the same thing ready when the 'live' rock arrives.
Depending on the packing, how long it takes for your 'live' rock to arrive and how ready you are for it to arrive will determine how much of your 'live' rock remains live.