I got my duolingo results. 99% Expert in English or 9.9/10. Here's what the certificate reads:
"Can understand virtually anything heard or read, even intellectually demanding material such as an academic lecture or a book on philosophy. Can use the language fluently and spontaneously in a way that can even be more advanced than an average native speaker."
Funnily enough though, Upwork won't put a blue verified check mark if I select 'Native or Bilingual' for English. It will only put it up if I select 'Fluent'. CS tells me that I need a 10/10 for that. Don't know whether to laugh or cry.