We are all other users here, so we cannot answer questions re. Apple's delivery schedule.
However, considering the current pandemic, you need to understand that nothing is the way it was. There are employee shortages or working from home, manufacturing delays, parts delays, and shipping delays.
So, no one will know exactly when your product will be shipped. Check your order status occasionally and/or contact Apple.
And, it isn't just computers: we placed a large order with several items at a big box store for a remodeling project: items are either back ordered, not currently available, and/or the delivery date is a ??. And, one of the items from a third party manufacturer will probably never be available: the company has shut down (most likely permanently) and we were not told until yesterday (after almost 4 weeks of waiting).