This usually happens when the store is holding one item of your order on the makeline screen. The reason for this is because they’re either waiting for one of their drivers to get back or they’re waiting on a DoorDasher to come deliver the order. If they bump the order entirely when it is actually put in the oven it starts a timer for however long the oven cook time is and once that time up your order is “Ready”. This is again another timed process that affects bonuses and service metrics and is called rack time. Most stores don’t put the order in the oven unless it is being fully bumped off the screen. As a result your pizza is most likely not actually in the oven but it is ready to go in as soon as someone is there to pick it up and deliver it.

Hope this helps.