@babel/preset-env do i need to add core-js to support all modern browsers?

Trying to look for an answer on Google. After installing babel-preset-env and using "useBuiltIns" : "usage" do i still need the following rule by default: "corejs" : "3"

.babelrc:

{
    "presets": [
        [
            "@babel/preset-env",
            {
                "useBuiltIns"   : "usage",
                "corejs"        : "3"
            }
        ]
    ]
}

This is my browserslistrc:

[development]
last 2 versions
last 1 Edge versions
last 2 Chrome versions
last 2 Firefox versions
last 2 Safari versions
last 2 Opera versions
not IE 11
not op_mini all
not dead
current node

[production]
last 2 versions
not IE 11
not op_mini all
not dead
maintained node versions

This topic always confuses me, I don't need support for IE11 since only support the last 2 versions of all browsers.

Is this browserslist support file stable and good? If not what would you suggest to add or remove?

Is it true that USAGE will automatically add core-js functions if needed?

Can someone explain me this for one and always.