Flyingeagle

Yes, at wheels up is the right answer.

There are two reasons for having the seats upright at take off...and landing.

First is if there must be an emergency departure from the aircraft during the takeoff phase (e.g. being on the ground in an unplanned situation) then the access to the exits must not be impeded. A reclined seat restricts the path for those passengers not seated on the aisle.

Second is that if there were a crash landing at take off (that's also an unplanned event), then the, "for your safety", phrase kicks in as the seat belts are most effective when the seats are upright.