If we're talking about 5G LTE, it requires from what I heard and I'm not 100% certain, Band 71 on the iPhone's radio/modem. So you saying it's unlikely, is on the money.
But yes, we're still a year or 2 (possibly 3) before we see this implemented into the iPhones. Band 66 was a shocker to me, because Apple is well known not to include a band unless it's widespread. My provider (Freedom Mobile) uses Band 66, but that's a story for another time.