Amber? When to cut?

You need a magnifier to investigate the trichomes

congrats on not flushing you did yourself a favor. i see your plants are like super small which can be best described as fun-size :) nothing wrong with that everybody can have a sub optimal grow so dont worry but mostly for that reason i wouldnt even worry about maturity and just harvest. youre not gonna get much out of those whenever you harvest so just move on to new plants

If most of the trichomes are amber, CHOP!!!!!! You're going to be losing a lot of THC the longer you wait. CHOP CHOP CHOP! There are divided opinions on whether or not flushing is required but if you want to do that, you're losing precious time with the potency of your harvest - so I personally would advise you to chop it all down now... Normally, you would provide only water for the last week or two of a grow to allow enough time for the plant to get rid of any chemicals it's stored up - but seriously, you need to chop now or have a really disappointing smoke... Good luck and good smokes!