Hi Rajeev
You can create outbound delivery either manually or automatic( PPF ) from outbound delivery Order.
Its not necessary that only it trigger after completion of goods issue.Check the link.
Outbound Delivery - Delivery Processing - SAP Library
Manual Creation Procedure:
Select the line item and click the button Outbound delivery.
Automatic procedure: Activate PPF ( Create Outbound Delivery) in outbound delivery Order
Note: Outbound delivery will only create after fully quantity pick.
Please let us know if you have further queries.
Thanks
AR