What do they do in DL/ML roles?

I am studying a DL course for the past one month. It's all theory and maths.
I want to know what will be the daily work routine of a DL/ML Engineer?
What are the tools will they use? Will they usually use PYTORCH or TENSORFLOW?
Do they write large amounts of code in Python using libraries like SciKit learn?

What are the Topics/tools should I study to become a DL/ML Engineer?
Suggest some books(not theoretical ones)/resources that can make me …

code course daily deeplearning engineer maths ml engineer pytorch roles studying tensorflow theory tools will work