RCI (they own Celebrity) is very good about disclosing any obstructions at the time of your booking. Whether you booked direct or with a T/A, their booking engine details pop up with the letters "OBSTRUCTED VIEW" in caps so it can't be missed.
I don't expect there will be any obstructed view balcony cabins on this ship at all. Obstructions are rare on Celebrity and RCCL ships anyway. They have them built a little different than some lines that hang the lifeboats in front of cabins, they hang them on activity decks.