Greetings rokonuzzaman32,
Welcome to Apple Support Communities. From the attached photo, its looks as if the backup is taking longer than expected. These steps can help with that:
"If your iCloud backup is taking longer than expected to complete
- Check that you're connected to Wi-Fi.
- Check your upload speed.
- Leave your device connected to power and Wi-Fi for 24 hours. If your backup still isn't done, archive important data then contact Apple Support. "
Further troubleshooting can be found in the Apple Support article:
If you can't back up to iCloud - Apple Support
Feel free to reach back out if you have any questions.
Best regards!