They mean slightly different things, Golak Das, and which you'd use depends on what you want to say. I'm not sure what you mean by "timeline". We need more context to explain the difference.
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Please give us context for these sentences – then we'll be able to help you.
Like I am at somewhere outside and a friend called me and tells that when are you going to return my books what should I say?
That's an unlikely-sounding context. How will going home help you answer your frined's question?
In American English, "get back home" would be unlikely. I would just say "Let me go home...".
Assuming that you don't know if you will be able to find the books, I feel that something along the lines of "I'm not at home right now. When I get home, I'll look for them and call you back" would be more likely.