Apps like zFont 3 (available on the Google Play Store) allow you to install custom emoji fonts on many devices without rooting.

Installing the latest version of Gboard can sometimes provide the newest emoji designs even if your system font is older. What’s New in the Android 9 Emoji Pack?

The safest way to get these emojis is by updating your phone's OS. Check for updates under Settings > System > Software Update .

For rooted users, you can download a flashable .zip containing the NotoColorEmoji.ttf file from repositories like bmaupin’s GitHub and install it via a custom recovery like TWRP.