If you have a flow that is triggered by a date field, you can run a Test on the flow to see which Items would be acted on for today's date with the current filter conditions.
Select the flow to test and click on the drop down button that appears beside the Edit button. Select Test from the drop down menu.
A pop up warning will show up. Select OK and the flow will run a test.
The result of the test run will be displayed. Use this to help determine if your date triggered flow will run properly on the expected items.
If the expected items are not on the list, you may want to re-evaluate your flow and test again.