Color specific feathers can tell the sex at around 6 weeks once they are fully feathered in, you are correct. However, the pointed saddle and hackle feathers don’t come in until 10-12 weeks of age. Before then all of those feathers will be rounded.
The chick isn’t old enough to have those pointed hackle and saddle feathers growing in yet. The chick is around 9 - almost 10 weeks old. In the next few days to the next few weeks the saddle feathers should start coming in to be definitive. However I have noticed that EEs, although being mutts...