Hey bro, I hope this helps. If you can get a magnifying glass, you could check the trichomes (the trichomes are what looks like hairs on the buds, the resin, so to speak) of your plant since this is the safest way to know when your plant is ready to harvest. In theory, there are 3 aspects of trichomes:
1.- Long and transparent trichome, the psychoactivity (it's more cerebral) is greater if you cut at this stage,
2.- Long and white trichome, for many this is in optimal conditions to harvest, and
3.- Long or short amber trichomes, the high will be more physical, so it's really up to the consumer's preference.
Also, check the time that the seed bank shows for the seed you planted since it closely matches the time needed to harvest, but don't forget that it can vary a bit since it's a living being.
I hope I was able to help with your question, good luck with your harvest, your babies look beautiful.