Yes it was an older Cal speaking to his mom.
I just read that Manifest was canceled so the rest will remain a mystery.
https://www.yahoo.com/entertainment/manifest-canceled-3-seasons-nbc-052144351.html
You are welcome my friend. She plays Miss Lucy in the Underground Railroad. It is scheduled to start on Friday May 14, 2021. IMDB shows her in only 1 episode.
All of the reviews that I have listened to (3) said that if you died, you do not transcend. Bellamy does not transcend. Since transcending is a choice, the others at the end declined eternal life to live a regular life with Clark.