How long to go?

I'd give that up to a week, by the look of it. But then...your diary suggests it's kinda young (though it looks older, like 11-12 weeks old)...so I'm not that sure. And personally, I certainly don't flush. I like to let it sit there and stink up the place real good. Unless you have obvious excesses. It's not like flushing removes anything from the plant, so if the plant is healthy with what you've been doing, flushing simply means it gets less healthy. If you've been using excessive stuff, too late to flush.

Those buds are ripen. It’s ready to harvest, but you should flush during 2 weeks before doing it.