For EU261 compensation, the arrival time will decide if you've a claim or not.
With 2hrs45min planed departure time, it might be very well that your final arrival time will still be within 2hrs in the end.
As Ditto said, you'll have to fly first, then you may have a claim.
Oh, and be prepared to put up a fight to get your money. They'll not pay out compensation "on the spot". Only when things REALLY went bad (As in, Germanwings-bad 60hrs delays) I've heard of EU261 compensation being paid right at the airport..