Deadline AutoApproval for Purchase Order

Summary

We want that system should approve after 3 days waiting on an approver

Content

Hi Dear All,

I want to ask about Purchase Order Approval. 
We don't have a problem with Approval Rules but 
We want Auto Approval for waiting 3 days approval on an approver.

For Example, I received approval but am waiting 3 days I didn't get any action about this.
The system should approve by the approver. If is it exist, Approval must pass next approver 

 

Is it possible? How can we manage this?

 

Thanks

Version

Oracle Cloud Application 20D (11.13.20.10.0)