928 exited cabin mods today and is on the way to SFO. Mods took about 30 days, so the A320s that are not undergoing a heavy check should take about the same amount of time, give or take. I'm not sure if any of the cabin mods are actually being scheduled along with heavy checks at the same time, but if not it will speed up the cabin mod process for sure.
https://flightaware.com/live/flight/N928VA