Ok, My two cents.
Based on previous comments.
2112:
Simply not going to happen since the T4E tour they have been playing it tuned down a whole step to enable Geddy to Sing it.
The only other track they have transposed to this tuning is Circumstances.
Like most bands Rush like to hit the audience with a one/ two so opening with 2112 would mean a pause afterwards while Ged and Lerxt changed Guitars.
Far Cry:
Won't happen,Lots of vdeo and pyro, more likely to end the first set, or open the encore.
Time Stand Still:
Good song theme wise but not exactly a hi energy track to open the show, maybe third or fourth
So what are we left with, SOR has used as an opener far too much, Big Money could feasibly be brought back, but I'm going to go with
Freewill, Its uptempo, a radio staple and the casual fan would recognise it