Just another data point for anyone else dealing with this - 2021 Laramie 1500 5.7 e-torque w/41,000. Bearing noise started a few hundred miles ago. Took it to the dealer today and they confirmed it's the MGU.
Service manager told me there are none available in the U.S. and approximately 5,000 on order.
Right now he's hearing 1-2 months. About 75 are on a priority list as the vehicles are dead (main fuse blown which is a common failure mode). I am on the next tier with about 1,000 other owners. The rest on order are for spares at dealers/warehouses. The SM *thinks* the delay is because they are coming out with a new revision of the MGU. I sure hope so - 40,000 miles isn't much for a major component to fail. Just outside of the regular warranty, too. Thankfully I had a 5yr/60,000 extended.
I think those of us affected should also file a problem report with the NHTSA. Those reports do carry some weight in getting a formal recall issued. If you do file a report, stress the safety concern of a possibility of the vehicle losing all power while in operation and traffic and/or the MGU pulley shearing off basically causing a catastrophic engine failure. Here's a link:
Report a Safety Problem | NHTSA
And here's a 2022 RAM TSB I found describing the MGU bearing noise problem and proper flashing technique. So RAM clearly knows about this problem.
S2208000009 RAM Powertrain Technical Service Bulletin