SQL Server - Always On High Availability Group Setup

We have an Always On High Availability Group setup with three database servers — two on the same subnet and one on a different subnet. The application server interacts with these database servers through the AG listener.

Currently, this setup is running with application version X, and we have received a new application version Y for upgrade/migration (which includes database changes).

To perform the application update, please clarify the recommended approach:

Should I remove the database from the Availability Group and point to the primary replica to continue with the application update?
or
Can I proceed with the application update while the Always On configuration remains active, pointing to the AG listener?