I'm not an expert on Neuralink, but the little bit I've seen from them it seems like they are in very early exploratory stages. I imagine this is an area of science that's very well understood. So they are likely blazing a path into uncharted territory. If the least they do is make meaningful contributions or discoveries in this field, I still think that's pretty awesome.
As far as delivering a product? I'm not aware that they've promised anything as far as that. Sure like most Musk companies they talk big game and throw around lofty concepts, but that's always been their strategy to churn up interest in the media.
Presumably they intent to start out with some type of device to assist paralyzed folks interact with computers/ phones. If they do achieve this, that would be remarkable. But this is realistically still what, just a guess, 3-5 years away?