In the past Apple has been ported to macOS several successful mobile apps, and cupertinos not plan to stay. Moreover, in the near future on the Apple desktop platform can receive Messages and Commands for Siri. A hint is found the famous developer Steve Trouton Smith.
According to available data, the Messages application will largely resemble its mobile version. This applies to both functionality and interface logic. The utility will be able to send different messages (text messages, effects, audio) and upload files.
As for Mac versions of the Commands Siri, the exact information about the functionality of this utility yet. However, Trouton Smith believes that the application will be far behind Automator in terms of available actions.
At the moment it is unknown exactly when Apple plans to add two new default apps in macOS. It is not excluded that the utility will be available with one of the largest updates macOS Catalina.