The natural way to start the Quantum London passle page has to be with a link to the Qubit Counter. Currently standing at 128 in August 2018 when I write this.
It will be intriguing to link back here over the coming years, and see the rate of progression.
I'm too new to all this to make a prediction, but I'll be back in a few months with a (still highly under-informed) view...
128 qubits, Rigetti, US