How to achieve the below functionality "once the fulfilment lines closed after 2 days SO header nee

Summary:

How to achieve the below functionality

"once the fulfilment lines closed after 2 days SO header needs to be closed"

Content (required):

SO header needs to be closed after 2 days of fulfilment line closure.

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):