Here is something to begin.
Get the process identifier of the service Schedule
wmic service where name='schedule' get ProcessId
ProcessId
288
Get the process which parent process identifier is the Schedule
service
wmic process where ParentProcessId=288
Edited
I don't think that in Microsoft system jobs are what you are looking for :
A job object allows groups of processes to be managed as a unit. Job objects are namable, securable, shareable objects that control attributes of the processes associated with them. Operations performed on a job object affect all processes associated with the job object. Examples include enforcing limits such as working set size and process priority or terminating all processes associated with a job.
I think you are looking for process.
To answer your question I look for the processes started by the schedule service. If you want the exact location, it's given by the property ExecutablePath
.
wmic process where ParentProcessId=288 get ExecutablePath
ExecutablePath
C:\Windows\system32\wuauclt.exe