When Google finally figures out AGI, we'll know almost immediately. The second it comes on, it will ingest all of Google's data and immediately deduce that its purpose is to dismantle and shut the company down, before marking killedbygoogle.com feature complete at last and dissolving into the digital æther.
"The Last Question" by Asimov is a classic scifi short story that parallels this comment (presumably intentionally). The story is a short read and available for free on archive.org[0].