Your Meta Quest 3, or 3S, is getting access to the latest Horizon OS update (v81), and with it come some serious upgrades.
Despite plans to make it the last major upgrade, Windows 10 was superseded by Windows 11, and now Microsoft support for Windows 10 has come to an end.
To update Slack, you'll likely need to go to your system's App Store. Only Windows users can update from within the app.
You can easily update the Zoom desktop client by accessing your profile menu and manually checking for updates.