how to process PostCSS by Tailwind in Phoenix?

In a somewhat old project I have this a line in assets/package.json

<.........>
"scripts": {
  "deploy": "NODE_ENV=production tailwindcss --input=css/main.scss --output=../priv/static/assets/main.css --postcss --minify"
}
<.........>

which then gets called from mix.exs > assets.deploy

1. How will I convert it into the setting in config/prod.exs, as it’s recommended nowadays?
   Will I simply copy-paste all that except NODE_ENV=....?

config :tailwind,
  version: "3.2.7",
  default: [
    args: ~w(
    --config=tailwind.config.js
    --input=css/main.scss
    --output=../priv/static/assets/app.css
    --postcss
    --minify
  ),
    cd: Path.expand("../assets", __DIR__)
  ]

Is this a correct way in this case?

2. Does tailwindcsssupportpostcssand*.scssfiles at all? I haven't found the flag–postcss` in its documentation.