Its hard to see the lower tail feathers with his patterning, but I think you have a boy. Looks like there are some longer, looser saddle feathers near his rear.
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I have been able to tell around four weeks by their feathering! The male's backs will be just about bare and the "wing bows" are naked, but the pullets will be pretty much feathered out. The comb usually has a bit more pink on it than the girl's do, too. I've been able to tell 1st by the comb and then confirmed by the feathering. Good luck... you only have a couple of more weeks before you can tell. I'm not a good judge on the tail feathers, however some people are!
Here is the excerpt from another thread:
https://www.backyardchickens.com/forum/viewtopic.php?id=162401
Edited to add: Ha! I didn't realize Gritsar had posted on this already! Gritsar has posted a lot of useful information, I've used the infomation above to accurately determine that I have had *way* more cockerels than a person should ever have! Thanks!
Cool. If you decide to start another thread to post them let me know and Ill def be checkin it out.