Need Macro to Auto hide rows

This seems to work but I have to run it for it to hide the completed. It doesn't do it in real time

Sub Macro1()
   
   Dim myrange As Range
  Set myrange = Range("M:M")
   For Each cell In myrange
   If cell <> "" Then
   If cell.Value = "Complete" Then
    cell.EntireRow.Hidden = True
    End If
    End If
    Next cell

End Sub