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The error message "Preparing metadata (pyproject.toml): finished with status 'error'" means that there was an error while installing PyQt6 due to an issue with the Python package manager (pip) and the metadata information in the pyproject.toml file.

To resolve this issue, try upgrading pip by running the following command in the terminal:

pip install --upgrade pip

Then, try installing PyQt6 again using pip:

pip install PyQt6

If the issue persists, try deleting the pyproject.toml file in the PyQt6 package directory and then try reinstalling it.

Alternatively, you can use a package manager like conda to install PyQt6:

conda install pyqt

This may work better on MacOS as it handles dependencies better than pip.