If anyone could actually tell you, they should also be able to tell you the winning numbers for lotto next week!
Are you suffering from a case of counting your chickens before they hatch?
Besides, you will just have to be patient, your plants can not read the instructions on the packet and will be ready to harvest when they are ready. What are your other options? Pulling them out and starting again?
Growing cannabis should be about deriving pleasure from the "I did it myself" factor and should not be about "how much can I get" or "why aren't they getting ready sooner". If it is, you are growing for the wrong reasons, in my opinion. Growing should be about having total quality control over the products you consume and not enabling a black market to thrive, where people will sell you absolute rubbish just to make a buck and with little regard for your well being. It is these monsters that home growing allows you to avoid. Here endeth the lecture,..... Organoman.