Sounds like you really have great stuff to go with. Our tomatoes are up and we just transplanted them today into bigger pots. Tamatoes are pretty transplant shock resistanht and you should see sprouts within a week!
I never had to tent my plastic wrap. As soon as I see the first few seedlings emerge I remove the plastic wrap. You don't want to leave the plastic wrap any longer then that or else you may have fungus growing on your seedlings.