Congrats on the new bike! I had mine set up with Stage I, SE slip ons, and SE Heavy Breather before I even picked it up. No reason to wait that I can see.
As noted you can do it at zero miles (as many have). It's how you ride the bike during the break in period that is important - not what accessories you have on it.
If you read one of my earlier posts, I just installed the Stage 1, SERT and Rush slip-ons. The bike now has a wonderful buzz in the handlebars that allows my hands to go numb on long rides... What was the question? Oh, mine has 5,300 miles. I had it done long with the 5,000 mile tune-up.