Problem: Materialized views can take minutes to hours to complete. Today, currentOp can show that a build is running and how long it has been running, but it does not provide an estimate of how long it will take to complete.

Impact: This creates operational uncertainty for application teams during rebuilds because they cannot reliably communicate how much work remains or when the rebuilt view is ready for use

Requested behavior: Provide an estimated time to completion for materialized view builds, and a clear indication of when the rebuilt view is ready for application consumption