If you want the widget to open on load of the website please add the below code under 
window.fcWidget.init({
"open": True, 


If you want the widget to open in x seconds, then make use of the following code,
<script>
var timeInMillis = 5000;
setTimeout(function() {
window.fcWidget.init({
token: "webchattoken",
host: "https://wchat.freshchat.com"
});
},timeInMillis);
</script>
<script src= "https://wchat.freshchat.com/js/widget.js" async></script>