If LR is cured, you can usually put it in your tank as long as it was not shipped to you. During transport, LR will experience die-off, causing it to become uncured rock. If you bought your cured LR at an LFS, and went straight home to put it in your tank, then you are probably ok. If LR was shipped to you, or spent hours in a bag/box, I would cure it in a seperate tank with saltwater, a heater, and a PH.
When you get LR, smell it. If it smells somewhat rotten then it is uncured. If it does not smell, or smells like saltwater, it's cured. If cured, put it in your tank. If not cure it in a seperate container.
You can introduce cured LR to your tank without concern, no acclimation required, IME.