I’d be shocked if MS hasn’t already stopped manufacturing, with how they overstuffed the channel.
Most likely, they’re waiting for a certain amount of standing stock at retailers to be sold off so they can formally announce the discontinuation of Xbox hardware.
Remember, they can keep selling games for the rest of the generation even if they’ve killed off the hardware, and they’re dropping physical media at a few retailers already.
Xbox dying off officially will be the quietest death of a console ever, since it’s already 90% done.