Xfinity stream/Flex

I currently have a tv service and Internet service. If I remove the tv service and only have internet, I could use the Xfinity Stream app correct? What channels are included for free? Local news and sports?

what’s the difference between the Xfinity Streams App and Flex 4K box? I don’t understand the difference between each. I just need to watch local news and sports and want to lower my bill. This is for at home not mobile.