Hi there - I work at Apollo and I'd be happy to help you migrate off our old CLI. That utility was sort of a hodgepodge of tools that we ended up either replatforming to our `rover` CLI or, in the case of code generation, recommending that folks use GraphQL Code Generator. It's a testament to that utility's sprawl that I can't guess your use case just by your name-drop of it. I realize the irony in my saying that since it sort of plays into this narrative, but FWIW all the functionality (and then some) of `apollo` is still actively maintained, just not in that particular codebase or form factor. Let me know if there's anything I can do to assist.
FWIW Apollo Client is actively maintained, has a lot of new features, and is preparing a v4 release (currently in Alpha). We'll be celebrating 10 years next year :)