I'm kinda surprised this deal seems to be 18A still. While progress, 14A is what really matters, as Intel has more or less been threatening to just give up if they don't get a large 14A commitment(unless that's changed recently).
Though, if this goes well, it stands to reason Apple may be that needed commitment.
As of August, 18A yield was reportedly in the 10% range. I would be surprised if anybody committed to 14A purchases right now.