grammar - Is "come sunrise" right?


I found this sentence in the book Artemis Fowl 2: The Arctic Incident:



Whether he escaped or not, the LAPD would be visiting evety dwarf in the city come sunrise.



I guess it means "when sunrise comes," but is it correct? And is it common usage?


PS: I'm a non-native speaker who never saw this kind of phrase before, and when I Googled “come sunrise” no explanation turned up.




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