But some breeds the females can also have rather pointy and shiney hackles.... saddle feathers, I think, are the better way to know.
They start to come in on the back about midway down and if it is a cockerel of around 3-5 months of age you should be able to see them coming in pointy.
Here's a pic of some saddle feathers from my Ameraucanas....
You're going to have to wait a bit longer... at least 8 weeks before the first real signs will start to come in. Are these true Ameraucana or Easter Eggers? My EEs were much quicker to show signs than my actual Ameraucanas.... I had 2 BBS Ameraucanas that were very slow in developing and still looked like pullets when the other cockerels were clearly cockerels. This was at 5-6 months of age. My EEs I could pretty much tell at about 8 weeks.
When you were a kid did you ever hear the expression "don't get your hackle feathers up"?
Once you see an adult rooster raise his hackles at a disobedient hen, you'll know where the expression came from.