Hi Peggy,
What type of information your project managers are interested to recieve?
Have they tried the Daily Digest feature? You would need to enable all of the emails from Setup that allow Project Owners to be up to date, and then they can subscribe for the Daily Digest from their Settings sections and recieve Summary related to all of the projects they own.
I have some steps here in this "https://community.workfront.com/blog/the-new-email-digest-feature-is-now-in-preview">article , the same applies for production environment if they are Early Access users. This should go to GA very soon. Here is the help site "https://support.workfront.com/hc/en-us/articles/231802907-Receiving-Email-Notifications#daily-digest">link with some additional info.
Cheers,
Anna G