By default Origin currently installs the game to your user Applications folder unless you have changed the setting. Remember you have two Applications folders, the system one and your user account one. This will automatically launch Origin and then the game. It has been like that for a few days now, with several switch it off and switch it on agains. So I checked to see if anything else was downloading - saw that Astroneer was updating, but both were stuck on Queued (nothing happens when you click the download arrow icon).
ORIGIN DOWNLOAD QUEUED FOR MAC
The Sims 4 received a major update for Mac users in April.