Google assistant will not work for me. I do not have a car with Google Drive. When an incoming text comes in, its not automatically read to me. If I want to send a text, I cant invoke it by voice and tell it to send a text to so and so. If I want to call someone, I can't invoke it by voice and say call so and so. If you can make this happen without Google Drive, please tell me how. I've tried a bunch of 3rd party tools, Bixby, and Google assistant.
By Google Drive, you mean Android Auto, correct? I don't have a vehicle with that either. My vehicles are older. One of them does have bluetooth, and my phone will read SMS's automatically when connected. I don't have that activated though, because it is the family van and I am never alone when I am driving it.
But Google Assistant does all the rest on its own. You need to go into Google settings and train the voice. Basically you say "OK Google" and Hey Google" a couple times. It will then wake your phone from screen off and unlock it, and it will do what you say.
I can also say (from screen off) "OK Google, read my last message" or "last 3" or something like that, and Miss Google obliges.
Does your phone have Oreo? My S8+ only got the voice wake and unlock feature with Oreo; it didn't work with Nougat.
You can also install the Android Auto app on your phone. You don't need it in your vehicle to work.