They have released it to the mainstream Excel users, but this does not mean you'll have it immediately. It depends on which precise update scheme you are on. Even then, they do not update everyone in the same update group at the same time to save bandwidth. It'll take a couple of months I expect.
Best Response confirmed by
Kushmah (New Contributor)
Hi Jan Karel, So there is no precise way of knowing when it will be available to which user. I have been waiting since April for a release to all public. It's a shame that such a useful function is not available to all already since it has been available to insiders for more than a year. Cheers