Show Popover without click

#1

How do you show a popover pointing at a button on page load (without having the user click anything)? Like this:

Here’s my current HTML and TS

home.html

<ion-content padding>
  <button ion-button (click)="showPopover($event)">Show Popover</button>
</ion-content>

home.ts

import { Component, ViewChild } from '@angular/core';
import { NavController, PopoverController } from 'ionic-angular';
import { RangeExtendPopoverPage } from "../range-extend-popover/range-extend-popover";

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
  constructor(public navCtrl: NavController, private popoverCtrl: PopoverController) {}
  showPopover(ev) {
    let popover = this.popoverCtrl.create(RangeExtendPopoverPage);
    popover.present({
      ev: ev
    });
  }
}