Bob Cornelissen has a management pack for monitoring scheduled tasks: GitHub - BCornelissen/SCOM-WinTaskSchedulerMP: SCOM Management Pack for Windows Task Scheduler
There is also an old one from Progel. It doesn’t support Windows 2016 and above out of the box. I was already using this one and ended up unsealing it, modifying it to work with 2016+, and resealing it. The files are available on SystemCenter.wiki but I would probably look to use the one from Bob. Progel Windows Scheduled Tasks MP - Community Management Pack