Finding Tickets where First Response is still pending

I want to build a scheduled task that finds all tickets where the First Response SLA is still pending. Anyone have any ideas how I would search for this? I was hoping it would be this value but its not.

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Worked this out in the end…

For any ticket where the First response is still pending the value of FirstResponseDateTime will be null.

Once met, a time stamp gets put in. FirstResponseDateTime: “2024-07-22 03:40:57”