Depending on your medium your growing in, I'd start off nutes right around now or in a few more days... Please start off the nutes at only 1/4 of what is called and wait for a few days and see how the plants respond... Look for nute burn or any other problems steadily increase feed each week... Majority of autos I've grown usually do good on half strength nutes, though there are the exceptions, the dragons LOVE to eat and can handle most that is thrown at them.... They also can be cal/mag whores... Give a your first feed VERY lightly, post pics, you'll get lots of help!
Sending you a big good grow karma cloud your way brother!