You will be off by 9/9.30am latest. After breakfast.
The ship docks at 5:15 in the morning, you can choose to leave at any time after that but you will have to take your suitcaeses with you down the gangway. We did it last time we went on navigator from southampton it is much quicker and easier. If you dont want to take your bags of yourself then you will be allocated a time up until 9/30.