You can set the chatbot widget to open instantly on page load my setting the OpenOnLoad configuration setting to true.

For example:

<script>
var collectchat = window.collectchat || {};
collectchat.ready = function() {
    collectchat.config({
        openOnLoad:true
    });
}
</script>

Adding this to your webpage where the chatbot snippet code is added will do the trick.

Note

Your website visitors may not like the chatbot auto-opening always. So, please be cautious and take feedback, when you are using this functionality.