Still white but with orange hairs present, a good indication it's ripeing up. If you can't use a scope, wait untilthe hairs whither up as opposed to simply change colour (think if you're using the hair method to gudge harvest, think it;'s roughly 50/50 white/red)
I'd also say 1-2 weeks. If you can though, get onto ebay and grab yourself a microscope or a jewelers loup for a couple of quid and check out the trichomes.