I was aware of those product features. They are ‘in one’s face’ on the Auspost website when looking for postal costs. From my perspective the delivery times for the Express and Standard are the same as they overlap and are indeed ‘estimates’. Some of my dated experiences are chronicled in Fun with Auspost.
Tracking Auspost style is in reality like a Airtag with a dodgy battery. You might know where it is, but you might not because of the lack of rigour in scanning except at the point of receipt at the PO and at delivery.
There does not appear to be any reasonably priced (in my eyes, say $10-15) internationally tracked letter product except Standard parcel that simply (is supposed to) advise where the item is, or in cases the last place it was known to be prior to having gone missing.
Once upon a time there was ‘priority mail international’ that met that criteria. It seems gone into history.
