Waiting is hard. Hang in there. 
You remind me of the 'few days' I waited to pick up Laker - it seemed an eternity. I had to wait till the weekend & drove in the holiday traffic on a very hot day with our air conditioner not working. [you'd think I could have found a Budgie a little closer but like you I feel for his looks & there was no other for me]
Do you have a small cage for travel/Vets? When I got him I carried him to the car in his cage. I put his cage in the front seat & used the seat belt. I opened the sun roof & took my time coming home. The first thing I noticed about him was that he was so interested in everything - he kept looking out the window & sang a lot. I talked to him the whole way home & played music as well.
Remember the first few days are pretty exciting for your bird too. Being really young he'll tire easily & may be a bit fearful from time to time. If you have a quiet spot for the cage, or drape it a bit, it will give him a safe spot to relax in.