That picture of "hops ready to pick" looks exactly like my cascade cones right now, and they are still a couple of weeks out. There ain't a brown leaf tip in that picture. Only brown hairs from the "burr" or "spur" stage. I will post up pictures of what they look like when I harvest, but you definately need to let them brown a bit on the bine. Today was the first day I smelled a slight hint of aroma, and it soon gets so strong it's overpowering....no....sexual to smell
Every zone is different, as is every variety. The cascade cones that I grow in southern lower MI get papery feeling and smell like a north Florida fruit farm in about two weeks or so. I know because I've had the plant for five years, and this will be the first that I actually harvest the thing. I'm re-born as a brewer this year, but have watched this plant every year.
I can't speak for any other variety, but hopefully I'll be able to comment on centennial, mt. hood, and hallertau next year.