Is RC2040M150CH MSP upgradable to 200amps main circuit breaker
You're good for that breaker swap

Since your utility is OK with the service upsize and the labeling on your meter-main allows it, putting the QOM2200VH in there instead of the existing QOM2150VH is fine.  You'll need to have the utility pull the meter (they can do this for no-charge during normal working hours) to do this safely, though, and also to make sure that the breaker screws and nuts are torqued to specification on the new breaker (this will require an inch-pound torque wrench).