<div x-data="{ loaded: true }">
    <div x-show="loaded">
        I've been Loaded
    </div>
    <div x-show="!loaded">
        Loading...
    </div>
</div>

[x-cloak] { display: none; }

setTimeout(function(){
    var scriptTag = document.createElement('script');
    scriptTag.src = 'https://cdn.jsdelivr.net/gh/alpinejs/alpine@v2.7.3/dist/alpine.min.js';
    document.head.appendChild(scriptTag);
}, 2000);