In our shipping regions you can change your shipment schedule (i.e. Thursday to Monday or vice versa, if your zip code qualifies for it).
Head to your Meal Plan page and click 'Change Plan' to the right-hand side of 'Meal Deliveries' - if you have 'Monday' and 'Thursday' as options at the top of the following page then you can click one of them and choose the plan you'd like for that day, and save your changes (allow the page to refresh) before 11:59pm PST Thursday prior to the upcoming week.
Toggle over to the other shipment date, and select any plan (doesn't have to be the same if you want to try something else out!). Allow the page to reload.
As you can see below, the plan schedule says 'Thu' under the Delivery Schedule: