calculated column for past due item

suhail_84 to display the status you can use JSON advanced column formatting again, although this doesn't save the status to the list it just displays it:

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/column-formatting.schema.json",
  "elmType": "div",
  "txtContent": "=if([$Due] > @now, 'NOT DUE','PAST DUE')"
}

If you wanted to save the status to the list itself so you could do other reporting on it then I would recommend building a simple recurrence schedule flow in Power Automate that runs once a day to update the list: if the due date is greater than utcNow() then set the status column to Not Due, otherwise set it to Past Due.

Rob
Los Gallardos
Intranet, SharePoint and Power Platform Manager (and classic 1967 Morris Traveller driver)