I’ve long used Automator for “quick actions” on files in the Finder. Now, with Mojave’s Quick Actions in the Finder – available when you’re in the new Gallery view – you can run your Automator workflows from this new interface, instead of using a contextual menu, or other method.
To do this, open a workflow, then choose File > Convert To… By default, Automator displays its file type dialog with Quick Action selected.
Click Choose, then press Command-S to save the file and name it. It will immediately appear in the Finder’s Quick Action More menu.
If you want it to be visible in the Quick Action sidebar, go to System Preferences > Extensions, then Finder. You’ll see a list of available quick actions. The first two items in the list show up in the Finder. Drag any quick actions you want to be visible to the top of the list. And you can uncheck any that you don’t use, so they don’t clutter up the More menu.
Unfortunately, I don’t yet see any way to show more than two quick actions in the Finder, before the More menu, so choose the ones that are really most useful to you.