Im on the CAE MPL, currently in Arizona halfway through flight training.
Ground school: no delays
Flight training Arizona: no delays currently, although flying out here is very unorganised and sometimes we only get 1 flight a week, other groups have been completely shafted being sent to Malaga for 6 months then to Arizona, so they suffered a 6 month delay
I personally stand by the CAE MPL programme being the quickest route to becoming an airline pilot. All flight schools are not great, but CAE is the best of a bad bunch in my opinion. Having experience with Leading Edge and L3 prior to me applying to CAE.