Is this chick a rooster ?

I got 5 chicks at tractor supply about two week ago so I really am not sure how old they are this is my 1st time doing it! All of the chicks are getting tail feathers and their wings look really uniform except for one 🤨. I was told that they will have a more of a round butt and jagged looking feathers if they are roosters. Can anyone tell this young? Sold to me as a Sapphire Olive Egger