Good luck, let us know if you get the card. I would be surprised if you do not, based on your score and the fact that you prequalify for the Green Card.
I had a FICO 8 score over 700 when I got mine, but I had a lot of weird things about my profile, mainly that my oldest account on Experian was three months old at the time. My only unsecured bankcard was one month old at the time. I got denied multiple times and eventually they demanded tax transcripts, I think simply as a way to make me stop applying. Then while I was on a vacation, I got an email saying that my application that had already been cancelled had been approved. I don't know how or why (I had ignored the demand for tax transcripts and I had not reapplied after my last application was cancelled), but I didn't argue. Amex is great, and once you have one card with them, it is enormously easier to get cards #2 and beyond.
As OP has been approved and approval thread has been created this thread is closed to further comment.
https://ficoforums.myfico.com/t5/Credit-Card-Approvals/Amex-gold-approval/m-p/5983668
https://ficoforums.myfico.com/t5/Credit-Card-Approvals/Amex-gold-approval/m-p/5983668