It already was added for phones in iOS 13 update last week.
It's in iOS 13 which was released last week.
Re:iPadOS
by FPGAhacker on Tuesday September 24, 2019 @01:45PM
(#21062721)
Yes, it’s on the phones too with iOS 13.
I previously used the swype 3rd party keyboard, and I’m not really a fan. It’s ok I guess.
Are there plans for this to be added for phone keyboards too? As one that appreciates it on Android, I imagine it'd be welcomed by many.