Ipad Recovery Mode Progress Bar Not Moving. Press and hold both the Home and the Top or Side buttons at the same time. After that reconnect your device with iTunes for restore or update.
Connect ipad to Macbook. The update may really be moving slowly. Let the device complete the update restore or erase process.
After 3 seconds keeping hold on SleepWake press Home button for 10 seconds.
If you are using Mac open App Store and click on Updates to check if there are available updates. It may just need a few more minutes. Let the device complete the update restore or erase process. When you see the option to Restore or Update choose Update.