Butchering meat birds at home

[Frizzll Farm]

Hello, a few of my birds are nearing butcher weight, few are also wheezing, we just gave antibiotics but as they are nearing butcher day we had to stop for withdrawal. How do I know if I were to butcher one at home what to look for if the meat is not safe for human consumption? Any pictures would be great as far as unhealthy organs look.