Hi Kaleem!
In the PCE UI, you can check for running traffic queries under Explore → Traffic/Map → Load Results. The number next to "Load Results" indicates queries currently being processed.
You should also check Reports for running or scheduled reports and avoid starting exports, support bundles, or bulk operations before the upgrade.
However, the GUI does not appear to provide one consolidated view of every asynchronous PCE job. For a definitive check, use GET /api/v2/orgs/{org_id}/jobs and verify that no jobs are still active.
Hope that helps. :)
------------------------------
Glenn Haarseide
Sr. Sales Engineer
Illumio
Oslo, Norway
------------------------------