The status of the PO can be seen here, and dictates whether action is still required for each PO.
For example, POs that have been Dispatched have been sent to you as the vendor, and the State is waiting for you to fill the order. Those with a status of Compl are those which no longer require any action by the vendor.
The date and time in which the PO was sent to you to be filled can also be seen here.