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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Async resolve check</title>
</head>
<body>
  <h1>Delayed resolve</h1>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    (function () {
      var lines = [];
      var dfd = $.Deferred();

      lines.push("before timeout: isResolved=" + (dfd.state() === "resolved"));

      setTimeout(function () {
        dfd.resolve("Finished!");
      }, 800);

      dfd.done(function (value) {
        lines.push("in done(): isResolved=" + (dfd.state() === "resolved"));
        lines.push("value: " + value);
        lines.push("state(): " + dfd.state());
        document.getElementById("out").textContent = lines.join("\n");
      });
    })();
  </script>
</body>
</html>

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jQuery deferred.isResolved() — async timeout (Try It)