Parront
Crossing the Road
After all that, I do think that your 2 Rocks are meat birds. You did what you had to, limiting their feed. They look good, but they do not look like a Plymouth White Rock, they have the look of a Cornish x Rock. The chest area is very wide. They stand up more, like a Cornish. If you want to see photos of birds like this look on the meat section of this site.yes you have everything correct
Here is a link to a thread with some feeding info:
https://www.backyardchickens.com/threads/cornish-rock-meat-bird-breeding-project.1400633/