An average effusion rate of approximately 150 cubic meters per second is estimated for the eruption’s first 24 hours, which is based on the rise in the lava lake level and assuming a flat surface.

Source: https://bigislandnow.com/2023/06/08/hawaiian-volcano-observatory-lowers-alert-levels-for-kilauea-expects-eruption-to-stay-at-summit/

The alert level change was warranted because no infrastructure is threatened by the eruption, and the initial high lava effusion rates are declining, the USGS says.

Source: https://www.bigislandvideonews.com/2023/01/06/kilauea-alert-level-changed-to-orange-watch/