Thank you so much!!!! Any idea on cost?
That is going to vary widely by dealer - some are doing it for free, others are charging between $50-$100+ (or more if you have a Lexus). The install will take at least an hour at the dealership, so it's possible they are passing on the associated labor costs. There are unsupported rumors claiming that Toyota Corporate is reimbursing the dealers for the installs, so the dealers may be double-dipping. Again, that is just a rumor.
Having said that, if you're reasonably tech savvy and adventurous, you can do the install yourself. I've already done that on my 2018 Camry XSE with Entune 3.0 Audio Plus. Took around 40 minutes to update the system and you need to keep your car running the entire time with a USB drive inserted. Also, you will need to download the install files, unzip them, and copy them to a USB flash drive formatted as FAT32, and ALL of that must be done on a Windows system. I can assure you from my own experience that if you do the download, unzipping, and formatting on your Mac, the installation will fail.
The instructions can be found here:
https://www.toyotanation.com/forum/...files-18-camry-sienna-18-19-lexus-models.html
And there is a related thread here:
https://www.toyotanation.com/forum/...648184-toyota-offer-apple-carplay-2018-a.html
Both of those threads are now quite large, but I encourage you to read the posts from djoyce101, fungabriel, and Virtual Steve (that be me) for additional info. There are separate file downloads available depending on whether you have the Base Entune 3.0 Audio, or Entune 3.0 Audio Plus, or Entune 3.0 Audio Premium (Navigation). There is a separate PDF file with the instructions for each version. If you follow the instructions without deviation, you should not run into any issues. Proceed at your own risk