is one piece episode 122 filler?

With Crocodile lying on the ground, Luffy demands that he get up and fight. Crocodile laughs at this statement.

Meanwhile, Vivi and the rest of the Straw Hats are in the Palace Square. Vivi explains that according to Crocodile, within ten minutes, a huge cannon will be fired, and once the cannon is fired, no one within a five-kilometer radius will survive, wiping out both the Rebel and Royal Army forces.

Zoro tells them that they need to find the cannon and stop the cannoneer from shooting.