Sending returns via the portal and having your client approve via portal automatically updates the return status to Ready to file. Otherwise, you need to update the status manually.
If you use the portal, you can also upload and send multiple documents to a client in bulk. For example, if you want to send a set of financial reports with the tax statement, save the reports to your computer, then attach them to the portal task when you send the tax statement.
To send a tax statement via the portal, you need to have created the client portal.