City are currently sitting not just at the top of the table, but comfortably, very comfortably, at the top of the table.
Currently, they lead the Premier League, by ten points, and have won 17 games (out of 21) to date: By way of contrast, Liverpool and Chelsea have both only managed to register 12 victories each: At this stage of the season, that is a considerable gap to hope to bridge.
To overhaul City, catch up with them, or dream of over-taking them, not only must their competitors play very well, and do so consistently, but, simultaneously, City must also play poorly, or drop points. For, if City keep to their current standard to the end of the season, they have won the title.
Now, this is not impossible, but it is less likely the longer the season continues.