The plants look healthy, but you need to throw in a bit more basic info, what strain (if you know, or if bagseed) how you have been growing 'em, indoors, outdoors, what light fixtures, nutes and soil. You know, that kinda stuff. They are looking healthy, but they are looking pretty young still. Be patient, it will be a while before they bud. But in saying that, if you doing an indoor grow you could put them into flowing time already. But flowering into smokeable bud will take about 8 to 12 weeks! But like I said try to be patient.
And hook us up with more info!
Peace