If my reservation status is RAC, does it mean the seat has been confirmed?

If your reservation status is RAC (Reservation Against Cancellation), it means you have a confirmed seat on the train, but you will likely share it with another passenger. The seat is not a full berth; instead, a single berth is divided into two seats for two RAC ticket holders124. While you are guaranteed to travel, you are not guaranteed a full sleeping berth unless there are cancellations or other changes that allow for a full berth allocation123. Therefore, while your travel is confirmed, your seating arrangement is shared unless further changes occur.