Correct, still very early. While the happy path right now is through Next.js, there's a hacky workaround for general use outside Next.js. As we move forward in stability, we'll be publishing more guidance for using it as a general bundler with any framework. Next.js is helping dogfood Turbopack prior to that, while in alpha.
So then calling it a release is misleading. I don't mind it being called a component or module of Next.js in the meantime, but release makes it seem like it is standalone.