No man, you're definitely not too late if you harvest next Saturday. Put 'm in the dark the day before (24-48 hours of darkness), it enhances the last THC production and the trichomes won't degenerate (turn amber) in the dark. It's even possible to put them in darkness today until Saturday, if you don't want them to ripen any further. Nice job, looks really, really good, much better than my first grow :).