No sign of flowering

Just wait. Don't change light times. Be patient. Will provide a bigger yield. Keep up a good lst on it and it can produce a lot of flower. I just grew girl scout cookies extreme auto not long ago. She was a late bloomer but results in end was more then worth it.

not much you can do unless you stress the plant into early flower. I find autos with more sativa in them take longer to bloom, even heard of one plant taking up to 9 weeks. At that point its no different then a photoperiod. Good Luck!

try 12/12 light schedule it's might be photoperiod

It's only an issue if they outgrow your space. Some of my autos have taken 8 weeks to flower but they were usually big yielders

If they are in fact Autos and not a mix up, then keep in mind Autos do what they want, when they want to... Nothing you can do will change that. Its actually good news if they are Autos as it means they should have been growing nicely this whole time and be a decent size- this means you are in for a great harvest so congrats!! However if its a screw up and they are photos then they will just keep getting bigger until you change the lights.