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Yes, in all engines. You can read the current status update that will be presented at the May TC39 meeting in a few weeks: https://docs.google.com/presentation/d/1Bx13eCgM9Rujs4zNdfO9...

It looks like the link within the presentation to WebKit's issue tracking their implementation is incorrect. It links to https://bugs.webkit.org/show_bug.cgi?id=180731, which is about support for BigInt in the Web Inspector, when it should link to the issue tracking the entire feature at https://bugs.webkit.org/show_bug.cgi?id=179001.