This is a simple plugin that adds an underscore separator and appends a timestamp to the end of your webpack watch builds. This will give you an indication when the build has completed.
Use version 2 for Webpack 4.
npm install --save-dev print-time-webpack
const PrintTimeWebpackPlugin = require('print-time-webpack');
module.exports = {
plugins: [
new PrintTimeWebpackPlugin()
]
};