Small UX note: the first time you run the command it only shows a URL. It's not until you run it again that you discover it also generates a QR code, which is actually the fastest way to open it on your phone. Would be nice if the QR showed up on the first run too, almost missed it.

You can also just open the app on your phone and go to the sidebar and click on Code and then you'll see the session at the top of your session list.