Approval delegation - can the original holder of the responsibility still approve?

Summary:

Hi! I wanted to query the approval delegation functionality.

Once the approval is delegated, i.e. for Time and Labor category, can the original owner of the responsibility still approve time cards through Team Time Cards page, or is the approval responsibility completely transferred onto the new person for the duration of delegation?

Based on Oracle documentation, I understand that delegation is primarily designed for scenarios there a manager is temporarily unavailable (e.g. on leave). The delegated person should receive notifications and approve/reject requests on behalf of the original manager during the effective period of the delegation rule. I wonder if delegation could be used for workload sharing too, rather than just covering absences.