they deffintly are all very nice looking. ESPECIALLY for your first grow. they look like they've got maybe a few more weeks to fill in until their ready, but i cant tell for certain. get a magnifying glass and look at the small crystals. when about 50% or even more have turned from clear to murkey/amber that's when you should think about cutting them down.
definitly read up more on the method of checking trichomes though becuase im not an expert either.

i realy like your plants thought, theyre all fine looking, and definitly please post pics of the harvest. but yea, the only real way to know when to harvest is by reading the trichomes. get a high powered magnifying glass or a jewelers loop if you dont have one yet. they look close, but definitly can fill in some more.