hello, you should do harvest when it suits you, depending on what kind of feeling you like.
If you like only head high, harvest, most trichomes are milky/cloudy, if you like couchlock feeling harvest when 10%-30% trichomes are amber.
Make sure that your trichomes are at least 60% cloudy when harvest, below that the buds are not potent and have no thc,
Another indicator that the plant is ripe are pistils that twist and turn brown, Happy growing pal!