XTS/XTL radios are absolute trash as a scanner for a couple of reasons. First, you can only scan 10 TG's (in NAS). Secondly, in order for you to program it for NAS, you need a system key. You can get these one of two ways. The first way, you are authorized to be on the system and you have a legit key. The second way, you pirate a key that is not 100% legal. You also run the risk of accidentally affiliating with the system. I can tell you that if you accidentally affiliate on our system, we will brick your radio.
I should also add that XTL/XTS only do Phase 1. If your system is Phase 2 it won't work either.
From looking at the Tulsa area, there are two systems. OAKWIN is a phase 1 system. and Broken Arrow Comms, phase 2. My guess is that you are going to a phase 2 system. When we went to a trunking system we went from XTS/XTL to APX. However, ours was a Phase 1 system and the old radios could be programmed to the new system.
Bottom line, stick with a scanner.