Should I harvest?

I would advise against cutting them; it's still too early. You should wait for at least 3 to 4 more weeks. When the white hairs turn 50%-80% red/amber, that's the time to check the trichomes. If you find around 10% amber trichomes, it's a good time to harvest for more THC. Additionally, more amber can lead to stronger couch lock effects. However, if the weather in your area worsens and you can't do anything about it, then I would recommend cutting them to avoid losing everything. Now, you can focus on feeding a little more PK to fatten the buds, just be cautious not to overfeed them or cause a nutrient burn.