In reply to mrphilipoldham:
The frequency at those small stations is rather low, only hourly I think. Might even be two hourly due to COVID, there have been some reductions.
This is a full list of the stations with parking in the Greater Manchester area:
https://tfgm.com/public-transport/park-and-ride
I'd suggest going for one of the Metrolink ones, as the trams are at least every 12 minutes and some every 6. Prestwich is just off the M61 so might suit, though it only has 30 spaces so I don't know if it fills up.
Or if you want further out Horwich Parkway might be a reasonable train option, again just off the M61 (J6), though. Half hourly from there and a massive car park which has almost no chance of being full with COVID still going on.
Post edited at 19:29