is one piece episode 54 filler?

A little girl on one of the Marines ships break free from her room after incapacitating one of her Marine guards. As the Marines begin to search the ship, the little girl makes it onto the deck and after climbing up the mast, accidentally opens up the ship's sail, causing it to tilt sideways.

She then jumps on to a life boat to escape. Back onboard the Going Merry, Luffy asks Nami if they reached the Grand Line yet when she tells him its only been two days.

Usopp then spots a flock of birds off their starboard side and Luffy stretches his hand out to grab what he thinks will be a fish.