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Actually, Courier 12 has been the standard since there was such a thing as fonts. And before there were computer fonts, pica was the standard, which is the same thing as Courier 12. This has been the case for well over 100 years.
Times has never, ever been the standard. Times is widely used because word processors are defaulted to Times, and this is the case because Times is perfect for college essays and scientists, etc.
But Courier 12 has always been the standard for print publications. You won't be rejected for using Times, editors have long since grown tired of trying to get writers to actually look up guidelines and read professional writing websites, so just about all will accept Times. But you make an editor's life much easier if you use Courier 12. Better yet, download and use Dark Courier 12.
Courier 12 allows for easy and accurate word count, it's easier to read, and it's far easier to edit than is Times because the letters are bigger and there's more room between the words and letters for proofreaders marks.