Welcome to the DIS!!!
I can't answer your question about the Wyndham shuttle, but my guess is that it will not be early enough. You want to go to the Magic Kingdom stop. The shuttle would have to leave you at the TTC and from there you would take the Resort monorail to the Contemporary. You will have to wait for the Monorail to arrive at the TTC station and then it is probably a 10 or 15 minute ride.
If you drive, you will park at the TTC for the MK. Again take the Resort Monorail to the CR.
You could park right at the Contemporary for breakfast, but you would have to move your car after breakfast to the TTC lot if you are heading to the MK for the day. It is just as easy to start at the TTC rather than the hassle of moving after breakfast.
I would call the Wyndham directly and ask about the shuttle times. You would need to be at the TTC by 8ish. You want to check in for your 8:30 breakfast at 8:15
Good Luck