The Model 3 Powered Trunk Retrofit is now available! I just ordered mine and set up an appointment. The option probably won't last long so get it while you can. Btw, I couldn't find the retrofit going directly to the Accessory page in the app. I had to scan the QR code on the website and that took me to the Powered Trunk Retrofit page in the app. Remember, the retrofit is for 2019 and 2020 Model 3s.
https://shop.tesla.com/product/model-3-powered-trunk-retrofit
https://shop.tesla.com/product/model-3-powered-trunk-retrofit