Hi Daryl Downey,
Let's check where you have your notes saved. They should be listed in the sections called "iCloud". If not, they will not, they will be synced by email. If you sync them to email, that email account will have to be set up on both iPhone and your Mac. It will also have to be enabled to sync the notes.
From iPhone, check where the notes are synced. Open Notes app. This is where you will see your Folders listed. If the notes are synced from other accounts. On your iPhone, go to Settings > Mail > Accounts, and choose the account and make sure the Notes button is on. From your Mac, go to System Settings or System preferences > Internet Accounts and check that Notes button is enabled.
If this continues, it would be best continue to work with Apple Support.
Contact - Official Apple Support
Set up iCloud for Notes on all your devices - Apple Support
Regards.