Both my Oct and Nov statements posted correctly and on time.
However, there seems to be a glitch with Amex that if the only charges on your card are Marriott properties, your points will not post. They’ll show up the following month or whenever you charge a non-Marriott related charge to the card. Could this be your issue? Not a problem for me as I have a few organizations I donate to monthly, but I’ve read about this before.