I think it's generous to say it's in its final stages. They haven't even left Phoenix have they? And even in Phoenix, it's still largely a beta project in a few predefined areas.
It certainly seems like Google's most likely moon shot to take off. But considering only a few thousand people have used it, it's not exactly a big success.
Waymo, like any and all software, will never be “complete” - but I assume you’re referring to Waymo being ready for it’s first “real” release somehow - but we still don’t know how exactly Waymo will be integrated into cars or which automakers will go with them.
That point of mine now has me wondering what Waymo will look like in 10-20 years’ time when autonomous vehicles become both ubiquitous and un-cool because it’s nothing new anymore (just like how Facebook is un-cool today). Will Waymo’s maintainers be adding new features that benefit the consumer, or will there be pressure to “monetise” it from every angle? And to what extent will brand-conscious automakers go to hide the fact they’re using Waymo, e.g. will they insist on rebranding it - not just for themselves, but between their own sub-brands (e.g. Ford vs Lincoln, or VW and Audi)?