onkeyup – Capitilize first letter of variable after 2 letters

$(document).on('keyup', '#item1', function() {
var myLength = $("#item1").val().length;
if (myLength > 2) {
$('#item3').css({"display":"block"});
$('#item1').val($('#item1').val().slice(0, 1).toUpperCase() + $('#item1').val().slice(1));
};
alert("each letter you type this pops up");
});