I am looking for confirmation about Lightning being turned on for all clients on January 7, 2020. All of our users are using custom profiles. This is what I want confirmed - If the System Permission 'Lightning Experience User' is not enabled for any of our custom profiles, the users with those profiles will not see the 'Switch to Lightning Experience' link next to their name when they log in. Even AFTER Salesforce turns Lightning on for us. Everything I have seen and read makes me think that will be the case. I just need confirmation. Thank you.