What would be the ELO of modern-day centaurs? The last public ranking of chess centaurs was in 2014, and only compares centaurs to each other. As of 2018, what would be the ELO rating of the best centaurs compared to the best humans and chess engines?

This is similar to this question, but two differences:


It is specifically about if centaurs beat computers, which is a subset of this question
The top answer is about a GM with a computer who does not have any training as a centaur, while we know that good centaurs have very different skills than good humans do.
Chess centaurs is not correspondence chess because centaur matches are played under the classical time controls. Unfortunately, centaurs is dead because the best strategy is just follow the engine moves.

In classical time controls, there's generally no advantage for human assistance. Humans are too slow, too clumsy etc ... we need more time.

This is 2018, centaurs matches are absolutely meaningless. They are like computer matches with dumb human intervention. Computer engines play stronger than human+computer unless the human player has sufficient time to digest the positions.

The answer to your question is the same ELO as the engine itself.