Hi @thusband,
A warm welcome to the Sony Online Community and congratulations on your new Sony Android TV!
Once you connect your TV to the mains the initial setup process will start. During this setup process you will be provided with the option to connect and configure the internet connection to your TV. As part of this process you will also be required to provide or create a Google user account for making use of the Google services which your TV is able to offer.
As soon as the setup process completes successfully you will reach the Android TV home screen, where you can find the Google Play Store app. You should be able to search and install the PLEX player app for Android TV from there. The PLEX app will require also an active internet connection in order to find and authorize your TV PLEX player app to access your PLEX server on the NUC. So make sure you provide the same PLEX account credentials as you have already on your NUC. Once you do that, the PLEX player app will discover and list the name of your existing PLEX server and offer to connect to it. You then will have full access to your entire library content on your NUC PLEX server.
Feel free to post all your questions on our community as I am sure there will many yet to come during these exciting days of setting up and making use of your new 4K TV.
Cheers,
Dutchice
