Cars going to Penske are finished. A car with temporary wheels would not be going to Penske.
Can't comment on any quality concerns, but it is common during a launch to identify concerns that need to be addressed before vehicles ship. This program is no different.
So, lots of questions on the process...let me try and summarize.
Body Shop - Bodies are physically assembled. This is the part you see on TV with the welding robots connecting all the pieces to make the body
Paint Ship - Pretty self explanatory...however, the tracking system you all use doesn't...