Congratulations! One thing to keep in mind is that those are technically broilers bred for meat. I know you want to keep them as pets so you should watch their protein intake. Broiler breeds on too much protein greatly decreases their longevity.
Not to be a downer, but it seems you mistakenly got a breed meant to be used for meat. It's a shame the person who sold them to you didn't mention it. While it is not entirely impossible to keep these long term, it usually takes a lot of management with the feed intake and exercise levels. They also may not be able to safely roost high up like normal birds. I'm not familiar with Texas Freedom Rangers, but typical Freedom Rangers are not supposed to be slaughtered past 12ish weeks. I would start monitoring these guys now if you don't plan to eat them.
Some people have done it with a lot of management, but it's a lot of work and they usually don't live quite as long as regular birds and don't lay as many eggs. You may be at an advantage to do this if you are committed, since these are Rangers and not Cornish X. There is an article or two on here that talk about raising meat birds long term. Let me see if I can find them for you.