Thank you for your post! Yes, the next MAPublisher release (MAPublisher 10.3) will be compatible with CC2019. If you have active maintenance, you will receive an email when MAPublisher 10.3 is released.
Let me know if you have any further questions!
Avenza Systems Inc
Adobe released an update to Illustrator 2021 (v25.3) that includes native support for M1 Devices and Rotate Artboard functionality. Please note these features are not yet supported within MAPublisher at this time. See compatibility notes.