Using Google Apps Script in with arrayformula?

I'm using an array formula in Google Sheets to determine when a cell shows 'Expired' based on date.

When the cell shows Expired, I've a script which should transfer rows with Expired to another sheet.

The script works to transfer when I manually enter Expired into the relevant column, but doesn't recognise when the arrayformula inputs this.

Wondering if there are any solutions to this?

Script below:

function onEdit(event) {

  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var s = event.source.getActiveSheet();
  var r = event.source.getActiveRange();

  if (s.getName() == "Open"&& r.getColumn() == 5 && r.getValue() == "Expired") {
    var row = r.getRow();
    var numColumns = s.getLastColumn();
    var targetSheet = ss.getSheetByName("Expired");
    var target = targetSheet.getRange(targetSheet.getLastRow() + 1, 1);
    s.getRange(row, 1, 1, numColumns).moveTo(target);
    s.deleteRow(row);
  }
}