When does Sword Art Online: Alicization return?

The third season of the Sword Art Online anime television series is based on the light novel series written by Reki Kawahara and illustrated by abec. It covers the first part of the "Alicization" arc and adapts from the novel's ninth volume, Alicization Beginning, to the fourteenth volume Alicization Uniting. The second half of the series, titled Sword Art online: Alicization – War of Underworld, adapts to the eighteenth volume, which is not covered in the light novels. The first opening theme of the anime is "Adamas" by Lisa, and the first ending theme is "Iris" by Eir Aoi.