Idiom: keep on the wheat rather than the chaff?

[Nicole]

Hi again, thank you all for answering my question about the phrase 'this shit is bananas'. I have another question, this time about an idiom: to keep on the wheat rather than the chaff

I suppose if you keep on the wheat rather than the chaff, you do a good job?

Thanks in advance and keep on rocking :)
Nicole
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[Jamie (K)]