Hi,
Please set your flow as the following steps:
- Create a scheduled cloud flow and set it sun every day:

- List all opportunities.

- Get the records.

- Add a “Condition” into the step.

- Adjust the condition expressions as:
the left one:
formatDateTime(outputs('Get_a_row_by_ID')?['body/estimatedclosedate'],'MM/dd/yyyy')
the right one:
formatDateTime(addDays(utcNow(), 14), 'MM/dd/yyyy')
- Add a “Send an email notification” step and send the notification email to anyone you want.

Here are my test results:
I received all opportunities whose Est. Close Date is 14 days later than today.

If this helped you, I'd appreciate it if you'd mark this as a Verified Answer, which may in turn help others as well.
Best Regards,
Nya