Looker Alert Issue

I am new to Looker and trying to create my first alert. The requirement is simple when a status field (calculated field) is greater than 1 looker should send an email. Though a couple of records value is more than 1 still not sending an alert. I didn’t schedule a delivery, just created an alert.

FYI: Row count exceeds 5000

I wanted the Looker to check every 15 min if the calculated field is greater than 1.

attached is the Snap of the alert