The store status returns the current status. It can have the following values:

open: the store is open and accepting orders.
closed: the store is either closed or outside of the opening hours.
busy: the store is open, but with a delay in the preparation time which is shown as preparationTimeDelay in minutes
paused: the store is temporarily closed within the normal opening hours and not accepting orders

For a full list of all store attributes and their definition, see the link below;