JSFiddle - React, Tailwind, and code Playground

HTML

<div id='message'>Default message</div>
<input type='button' onclick='Run();' value='start'>

JavaScript

function Run() {
    var delay = 3000; //-- 3 seconds    
    $('#message').text('Please wait ' + (delay/1000) + ' seconds...');
    setTimeout(function () {
          $('#message').text('Done');       
    }, delay);
}