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Is there a straighforward way for a task to know when the flow-run started? Wanting to include this in a slack notification.

Looking in `prefect.context`, the closest thing I see is `scheduled_start_time`, but we are intending to kick off this flow manually.

prefect.context.scheduled_start_time is the closest one i can think of

Kicking off a flow just creates a flow with schedule of “now”

is `now` evaluated once at the time the flow-run started, or is it evaluated dynamically each time `scheduled_start_time`  is accessed?