Icon visibility and alert message

I created a icon by passing a memory tag value using visibility binding in a expression and added a map transform if the value is 2 it should show true and icon visible. But if the tag value is 2 more than 30 minutes it should give a message that value is 2 more than 30 minutes .how it is possible? in perspective

Use the Timestamp of the tag.
Below is an example using the system tag "[System]Gateway/Alarming/Active and Acked":

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