Don’t forget that the current gen A processors are designed to run in something with a tiny battery compared to a laptop. It’s likely that any MacBook bound Apple CPU won’t have such a limitation and will be able to run much faster as a result.
Also if you look at the performance trajectory of A-series in the last five years, 2020 sounds about right for where the crossover will come even between iOS based A-series processors and the fastest of what Intel has to offer, provided they can keep up the pace of performance improvement.