Automatic Complete Order module can change processing order statuses to complete status after defined days. It saves your time to look up shipped or proceeded order and change their status to completed when the package arrived at the customer. For example, you may use the module to update shipped status to completed after 7 days.
You are able to define more than one processing order status and how many days after the orders should be completed.
The module uses Event so no files will be overwritten.
OpenCart 3.x DEMO