My MacBook Pro is running the latest version of Mojave, but I can't see any of my reminders on my MacBook after the update. Suggestions?

See Get ready for the new Reminders app - Apple Support

including the following from that link:

Upgraded reminders aren't compatible with earlier versions of iOS and macOS. If you upgrade your reminders on your iPhone with iOS 13, your iPad and Mac using the same iCloud account can’t access your reminders until iPadOS and macOS 10.15 Catalina are available. Learn what to expect until all your devices have the latest software.