The newest stuff for the Steam Deck is out now, and some people have received it already. THE DECK DOCK.
With the Steam Deck Docking Station, you can connect your Steam Deck to your TV or screen. Play on the big screen using an external controller like the Xbox Series controller.
Yes, there were other ways before to connect your Steam Deck to big displays. Now, there is an official way. The new Dock has DisplayPort, all the other things you need and an extra charging cable.
Price
The new Steam Deck Dock will cost you around $90 in the US or €99 if you live in Europe. If this is too much for you, you can find a good USB-C hub. It will essentially offer the same functionality. But maybe you’ll miss the DisplayPort connection.