"Arrive early" really means less delayed then usual. My M3W was supposed to be built in February week 8. It was delayed to March week 11. From what I have heard, that 3 week delay is pretty quick. I've heard of much longer delays. So by saying "arrive early" that might just mean delayed 3-5 weeks instead of delayed 8-10 weeks.
Mine was 16 weeks late. But i'm special!