Following your message I have had further discussions with Southbank to clarify this matter. The old publication routine until the recent change was to aim for readers to receive the print edition of TDL on the third Saturday.
When the new schedule was introduced recently, it was decided that for most months the issue date of the print edition will be the fourth Friday so that readers should receive it, post permitting, the next day. Occasionally though this may need to be varied due to public holidays or production bottlenecks. Additionally, an email PDF version of it is released late Friday and readers will receive that before the print edition.
When you raised your query, the website must still have been showing the old schedule and I have asked them to update it.
Hope this is now clear and apologies for the confusion.