While there is no standalone Facebook app built specifically for macOS, you can still "download" Facebook to your MacBook Pro for free using several official and reliable methods.
Here is everything you need to know about getting the Facebook experience on your Mac without constantly opening a browser tab. 1. The Official Safari Method: "Add to Dock"
The most reliable way to get a "Facebook app" experience on a modern MacBook Pro (running macOS Sonoma or later) is to use Safari’s built-in web app feature. This creates a standalone icon in your Dock that opens Facebook in its own window, separate from your other browser tabs. Open Safari and go to facebook.com. Step 2: Log into your account.