I actually just went through this process. I bought a 2018 with just over 56k miles on it back in October. I didn’t notice anything until a couple weeks later when the weather cooled off that I had the rattle at startup and then the ticking at idle. It was out of the factory warranty but I was luckily still within the 30day 1k mile warranty I got from the dealership I bought it from where they cover 50% of parts and labor.
I took it to the local Ford dealer and they did the overall vehicle inspection and as expected I had the phaser issue. I got half the money out of the dealer I bought it from as noted above. Then as I’ve read others have done, I called Ford customer service since this is a known issue to try to get them to contribute to the cost. After several phone calls and several weeks they ended up covering about half of it, so I really had to pay nothing. I also got them to include a 3year 36k extended warranty which I was really happy about. I’m just bringing that up in case you have any issues utilizing your third party warranty. It was a hassle but worth it since it worked out for me. From what I’ve read have had some success with this as well.
I had it repaired at my local Ford dealer and after having it back a couple weeks, knock on wood no issues. Like others said they’ve done so many at this point I wasn’t too worried. I was more concerned with them scratching the paint or something leaning over it all day long for three days.
One recommendation from me, I had them replace the valve covers since they were off anyways and you’d only be paying for the parts. Pretty sure I had the hairline crack in the driver side cover that was leaking oil which I believe is common.
I would also have them put on a new water pump and thermostat housing. I have no idea why that isn’t standard with this repair but at least in my case it wasn’t. Again the labor is already in there so you’d just be paying for the parts.
Good luck.