The "quantum computers" we have are classical computers with very weird hardware. The thing everybody is trying to achieve is quantum supremacy - this hasn't been achieved or demonstrated yet, and might never will be.
Google already has a 72 qubit processor (Bristlecone), but whether they or anybody will be able to demonstrate supremacy in the current, next, or some future generation is entirely conjectural. The main limit is error correction, and there are theoretical arguments (Gil Kalai) for why achieving supremacy might be impossible.
> Literally the only difference between the state of the art and quantum supremacy is scale.
This is simply incorrect. At the moment it's unclear that quantum supremacy can be achieved at any scale whatsoever, and it's certainly possible that it's unachievable even in principle.