Yes, Reporting is still available for an archived phish, and you can also still opt to export it.

• If you choose to 'archive' a phish, this will simply stop any remaining targeting that has yet to be completed.
• Note that 'clicks' will still be registered after the phish has been archived.

For further information, please refer to the following article: 

• Are 'clicks' registered after a phish has been archived?