You can see the full list of supported devices here. But, to summarise, Peacock is now available to watch on the following devices:

• Desktop browser: Peacock.com/tv 
• Apple devices: iPhone, iPad, iPod Touch, Apple TV 4K, Apple TV HD, and the Apple TV app. You'll be able to sign up for Peacock or upgrade your membership with in-app purchases as well.
• Google devices: Android phones and tablets and Android TV devices, Chromecast, and Chromecast built-in devices. If you sign up through Android and Android TV, you get free access to Peacock Premium until 15 October.
• Xbox One consoles: Microsoft's Xbox One family of devices, including Xbox One S and Xbox One X. You can even get it from the Microsoft Store. You'll be able to sign up for Peacock or upgrade your membership with in-app purchases on Xbox.
• Sony consoles: PlayStation 4 and PlayStation 4 Pro consoles (from 20 July 2020).
• Smart TVs: Vizio SmartCast TVs and LG Smart TVs.
• Amazon: Peacock is supported on Fire TV and tablets with Fire OS 5 and above.
• Roku: Peacock is supported on Roku 2 and later devices, including soundbars.