I have kept it for ipad overnight but it has not updated! And my WiFi connection is stable and it's unlimited.
My ipad is not getting updated even though I have kept it overnight with a stable internet connection.
iPad Air, iPadOS 14
You need to have at least 50% battery and the device needs to be connected to power. If you look, the download has paused, and you need to do those things to get the download to start again.