There is probably a website or wiki or something that would tell me this but I don't know where it would be. How far along is the conversion of the longer range 737 (transcon) to include full E+?

I have been avoiding sCO planes completely but have a couple of flights to WAS coming up and they seem to mostly be on 737s now. I'd rather cram myself into a CRJ to DEN and connect to an Airbus than suffer the old CO Y for 5+ hours.