I’m currently reading the Wool omnibus by Hugh Howey. It’s pretty decent I’ve been making very rapid progress as it’s been too hot to sleep here recently now the summer has arrived.
I haven’t seen the Apple show, but maybe I’ll watch it in the future when I’ve finished all the books (I had Shift and Dust as well).
Read the three prequel books in the Shift series once you finish the Silo books. They explain how everyone came to be living in the silo, and help answer a lot of questions.