I hit 20 before finishing the main story. No Engrams
Looked around, people say "complete the story" I do that, Red war's done. Still no engrams
I talked to every NPC I could find on the Traveler and in the farm, Nobody gave them to me or anything so It's either I missed a button tucked away somewhere or I just didn't get them.
Before anyone asks, yes this is my first character to reach 20. My only other character is a level 1 and I do not have another Titan.
Edit: I did literally nothing and immediately after posting this, Tess suddenly had a package for me
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If you have forsaken, it may now be level 50 when you get bonus engrams.