Garry Bargsley has a quick dbatools script to find running SQL Agent jobs:
Do you run SQL Agent Jobs in your environment? Do you know what is running at any given time? Most people do not know what is currently running if you ask them.
There are several times I need to know what job(s) is running on which server. For instance, let’s say on the morning of monthly maintenance you want to check to make sure all your important ETL jobs are complete or that there are currently no database backup jobs running.
Read on to see the cmdlet and how you can use it to query across a broad set of servers.