Congratulations on your new iPhone! I understand that when setting it up, you restored it from an iCloud backup, but it's stuck restoring some of your apps. I'm happy to provide some help for this issue.
Check out the information provided for this issue in the article below:
If iCloud Backup couldn’t be completed or you can’t restore - Apple Support
If the restore process takes a long time to finish
Stay connected to a reliable Wi-Fi network and a functional power source until the process finishes. The time it takes to restore from a backup depends on the size of your backup and the speed of your Wi-Fi network.
If you see a grayed-out app or one that takes a long time to load, make sure that you're connected to a Wi-Fi network. Next, tap the app to pause the process, then tap it again to continue. If this doesn’t fix the issue, delete and redownload the app.
If you're already connected to Wi-Fi, it may help to restart your iPhone to help with this:
Restart your iPhone, iPad, or iPod touch - Apple Support
Thanks for using the Apple Support Communities. Cheers!