cream of the crop, the - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The best or choicest of anything, as in The apples from this orchard are definitely the cream of the crop. The noun cream has been used to mean “the best” since the 16th century. The French equivalent of the present term, la crème de la crème (“the cream of the cream”) was familiar in English by 1800.