Make Typekit non-blocking for smaller screens and serve up 2 different kits

typekit.js

  <script>
  var kit;
  // Adjust the width threshold
  if( window.innerWidth < 800 ) {
    //Replace this with your mobile Typekit code
    kit = 'xxxxx';
    document.write('\x3Cscript src="//use.typekit.net/'+ kit +'.js" onload="try{Typekit.load();}catch(e){}" async>\x3C/script>');
  } else {
    //Replace this with your desktop Typekit code
    kit = 'xxxxx';
    document.write('\x3Cscript src="//use.typekit.net/'+ kit +'.js">\x3C/script>');
    document.write('\x3Cscript>try{Typekit.load();}catch(e){}\x3C/script>');
  };
  </script>

Hey there, is this script still up-to-date?