Totally normal, and no real definitive of when it will return. I exclusively pumped for 11 months. Stopped overnight pumps fairly early on as I was an oversupplier. I didnt get my first period until I was 13 months Post Partum.
I’m almost 15 months pp and no period yet.
No one can really tell you when. Though there is theory that if you're not feeding/pumping between 2am and 5am you could start to cycle again.