If you’re not sure about your specific Mac model, see Apple’s support page on Continuity system requirements.

Finally, all iMac Pro models support Continuity. Mac Pro and iMac models from 2019 forward support Continuity, as do Mac mini models from 2020 forward. Generally, if you have a MacBook model from 2018 and later, it probably supports Continuity. If you have an iPhone 7 or newer, you’re compatible with Continuity. On the iPhone side, this is relatively simple. If you are a QuickTime 6 Pro user, see this article: before proceeding with this installation.To mirror your iPhone to your Mac, you’ll need both devices to support Apple’s Continuity feature. Installing QuickTime 7 or later will disable the QuickTime Pro functionality in prior versions of QuickTime, such as QuickTime 6. If installed on other versions of Windows, it may not offer full functionality. QuickTime 7 is for use with Windows Vista or Windows 7. If you still need this legacy plug-in, you can add it back using the custom setup option in the installer. The QuickTime web browser plug-in is no longer installed by default and is removed if you have a previous version of QuickTime on your PC. For information on the security content of this update, please visit this website. QuickTime 7.7.9 contains security updates and is recommended for all QuickTime 7 users on Windows. If you no longer need QuickTime 7 on your PC, follow the instructions for uninstalling QuickTime 7 for Windows. All current Windows web browsers support video without the need for browser plug-ins. New versions of Windows since 2009 have included support for the key media formats, such as H.264 and AAC, that QuickTime 7 enabled.

Important: QuickTime 7 for Windows is no longer supported by Apple.

Quicktime for mac 2018