In a termination suit, after a hearing, the court shall grant a motion for a preferential setting for a final hearing on the merits filed by a party to the suit or by the amicus attorney or attorney ad litem for the child and shall give precedence to that hearing over other civil cases if:
(1) termination would make the child eligible for adoption; and
(2) discovery has been completed or sufficient time has elapsed since the filing of the suit for the completion of all necessary and reasonable discovery if diligently pursued.