I need iTunes in order to unlock my phone

Here's another supporting article that shows some of the screens you may see when using Finder to access your iPhone:

Starting with macOS Catalina, the Finder replaces iTunes as one of the ways to sync your device with your Mac.

Use the Finder to sync your iPhone, iPad, or iPod with your computer - Apple Support

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Correct. iTunes is no longer supported for Mac. You use the finder instead.

If you forgot your iPhone passcode - Apple Support

It's already built in under Finder if you have Monterey 12.4. iTunes only applies for Windows now.