If they're actually wheaten.. then around 2 or 3ish weeks (if I recall correctly) the boys will start to feather in much darker. And by 6 weeks there should be NO question.
Not regarding the pattern, but regarding wing feather sexing.. I believe that is only done on fast feathering breed cross to slow feathering then offspring may be sexable by wing growth..
https://www.cacklehatchery.com/what-is-feather-sexing-separating-fact-from-myth/
They aren't slate at hatch just like feather color isn't mature yet.. Marans aren't hatched with white legs either in my experience! Talk about confusing to any average person.
See example of wheaten chicks from the Ameraucana.org site..
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With the OP's being so white looking.. Not sure if that's age related but I almost wonder if it could be blue splash wheaten. If splash then the coloring may not be as obvious within a couple weeks as what I describe. And I don't think splash (or splash wheaten) is an "accepted" variety of Ameraucana even though breeding two blue wheaten could produce it.
Swedish Flower tend to show their gender fairly early with many boys being very obvious by 6 weeks.
Congrats on you hatch and beautiful babies!