Leveraging async/await for the Ember runloop, simply.

async-await-runloop-example.js

const emberRunloop = (queue = 'sync') => new Promise(resolve => {
  scheduleOnce(queue, () => {
    resolve();
  });
});

export default Component.extend({
  async _myFunction() {
    await emberRunloop('afterRender');
    // Do your stuff after above specified ember runloop
    // https://guides.emberjs.com/v2.18.0/applications/run-loop/#toc-toggle
  },
});