SlowInit.js

render() {
  return (
    <div>
      {this.state.timeThen > this.state.timeNow ? (
       <>
         <button onClick={() => { /* some action */ }} />
         <button onClick={() => { /* another action */ }} />
       </>
      ) : (
        <button onClick={() => { /* yet another action */ }} />
      )}
    </div>
  );
}