You will have to select a Organization with Workers already setup when using the command. It will show up in Frontend as a new project with evaluations. It should cache everything it can. And it will stream back build logs to your terminal while building. There is also a evaluation cache (the cache that lies on you system at ~/.cache/nix/eval-cache-*), which there is currently be worked on for better control in Rust, see libexpr-c: expose essential evaluator functions for derivation tree inspection by NotAShelf · Pull Request #15842 · NixOS/nix · GitHub and Support nix-eval-jobs · Issue #39 · NotAShelf/nix-bindings · GitHub. So we can have better control over the eval-cache and pre load e.g. Nixpkgs from the Server to the worker.