If your going to try and offer F/T first than I would wait the week but its really up to you. If you feel that he's settled in well and that he's not showing any signs of stress than I don't see a problem in feeding him earlier. I fed my guys 3 days after I brought them home and 4 out of 5 ate. If he doesn't eat you've set the feed schedule and you shouldn't offer for another week - so keep that in mind.

cheers.