Harvest Soon?

At least 2, maybe even 3 weeks or longer to go. Once there are 98-99% brown pistils/hairs, you will be entering the harvest zone.

Those calyxes still need to plump up, then ripen. so... longer than you might think. Once the calyxes mostly envelope the stigmata, maybe 10-14 days longer. depends a lot on the plant you are looking at.

No, you still have at least 3, maybe 4 weeks to go. Autos can be a bit slower outdoors and she's still early in flower and is busy bulking up. It looks like she has some nute burn, so you can dial down you feeds slightly.