Automating a push notification based on a cell value


I have an automation process where I need to push a notification based on a specific time value within a cell.

So the data's coming in from a form with the date and the hour a phone call needs to be made. I.E 14:00.

When 14:00 rolls around I want to push a notification to someone listed in a contact cell.

Any ideas on how I can do this?