If you look under "harvesting" in the forum, you'll see a sticky by fdd2blk, the very first post pretty much covers when to harvest... after that there are a few posts on how to. judging by the pics you just posted you dont have too much longer. hope all goes well.
Auto's take around 70days from seed but seem to benefit from an extra few days, so aim for around 75 - 80 days.
When drying / curing try to hang the bud upside down in a dark cupboard for a week. If it's hung it will retain it's shape and look nice when it's dry. After a week put it into a glass jar for a further 2 weeks to cure. Open the jar every day for a few minutes just to make sure no mould forms. If you can wait the full 3 weeks you will really enjoy the smoke.