Does Saturday delivery only come on Saturday?

Hi,

I ordered an iPhone 14 pro max a couple of days ago. On the delivery options I picked Saturday delivery (22/10 - 29/10) as it was faster than the express delivery (25/10 - 01/11) but I was wondering if this only means it will be delivered on Saturdays, specifically that Saturday 22/10? I would obviously like the phone to come sooner, and thought maybe if I had picked express delivery it would be updated and arrive faster if the stock was available sooner , however as I picked Saturday it might not and will only be delivered on that Saturday? Can anyone from Apple advise whether this is the case or whether it will be delivered asap as the stock is available! Thank you