iOS 14 is now available to all users with compatible devices, so you should see it in the Software Update section of the Settings app on your device.
Can I not get iOS 14?
The unable to install iOS 14 issue will happen when there is no enough space on iPhone iPad. You can delete some useless apps, old messages, unwanted photos, or songs to free up space. Just back up your device in advance in case you delete some important items accidentally.
Why do I still not have iOS 14?
If your iPhone won’t update to iOS 14, it might mean that your phone is incompatible or doesn’t have enough free memory. You also need to make sure that your iPhone is connected to Wi-Fi, and has enough battery life. You may also need to restart your iPhone and attempt to update again.