Looks good and nice implementation. But still we are starting the jobs in a sequential order not parallelly. This approach works as there is very minute lag between the start time of those individual jobs.

However to kick them off simultaneously, you can define the schedules of these jobs to let them kick-off at the same time. That way instead of manually kicking off (sp_startjob) they would start at the same time by the scheduler.

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SQLBuddy