you could harvest it at anytime would probably suggest you pick a couple of buds off now and let the rest go another couple of weeks.
there is no specific time to harvest even when using a magnifing glass it is more personal preference there is plenty of people that harvest early becuase they prefer the high of clear trichomes versus waiting until they turn mostly cloudy or even amber by taking a couple of buds now and waiting a couple of weeks before you harvest the rest you will be able to decide for yourself for future grows which you may prefer.