I would have thought that, with a match on Friday, the squad would be back in training by tomorrow for sure. As for when, something like half nine to ten thirty would be best I reckon for the actual session. I can't help with where because there are quite a few pitches at the Vale, but you should be able to see the City squad on one of them from the car park. One thing I would say though is that a lot of clubs are not happy about members of the public watching their training sessions, so I'd be prepared to be told that you are not welcome while the training is in progress, but, hopefully, it would be different once it had finished as far as things like autographs and pictures with the players are concerned.