It is not close to being finished yet, it is not yet time to prepare for harvest. Your plant is only 4 weeks into flower, still developing a lot more bud and not nearing maturing for some time. I would expect it to still take 5-6 weeks, maybe even longer since you grow outdoors which often takes a little longer than the usual guidelines based on controlled indoor grows with intense consistent lights and stable environment.
Also I would not suggest not watering for 2 weeks, your plant will dry to crisp and die in that time. Fast drying in general is not really seen as a good thing, longer and slower dry preserves all the good stuff in your plant better, drying too fast can lower levels of THC, destroy terpenes etc. If you choose to want minimal moisture in your plant at harvest due to humidity control and mold concerns, 2-4 days without watering pre-chop is enough - basically just harvest when it would naturally be the next time to water the plant or max a day after.
Just stay patient and don't try to take shortcuts, the result will be worth it 😊