Welcome to Yorkie Talk and congratulations on your new puppy! Bentley is adorable. He probably will be a big boy. We have a "Teapot" club here (a little joke on teacup).
The general rule is to double the weight at 12 weeks and maybe add a pound to guess adult size. Many Yorkies don't follow the rules.
Cloud 9 beds are washable. I don't think it would too big for Bentley. There are pups his size who love them.