“We will provide sufficient migration time for developers - at least 6 months of heads-up - before beginning any experiments to turn off MV2 in the browser next year.”
In December Google froze the Manifest V2 shutdown and promised an updated schedule by March. On March 29 it delivered an update with no schedule. The big fix so far is session storage going from 1 MB to 10 MB. The one sentence that never changes is “We remain committed to the rollout of MV3.” The delay is about when, never about whether.