There still is no Timelines feature or Animation Triggers feature in the Mac version. All you can do is add Animation Effects [from a limited assortment] to the Bookmarks you create. Also, there is no Bookmarks list or Advanced Animation pane as referred to in this Windows article.
To add effects to a Bookmark, select the Bookmark then go to the Animations tab to choose the effects you want to use.
The term trigger is used confusingly in that KB in the context of 'cause to occur' & is completely unrelated to the Triggers feature in the PC version.
NOTE: Microsoft is supplying some features only to Office 365 subscribers. My comments above are based on my installation of v15.27 which is a Retail License (non-subscription) package.