I myself often do not get to a book until weeks after I got it. I am currently reading 3 books and if I get gifted one now, I have to finish at least one book preferably two before I start on the new one. I think asking about it while you can still use 'the other day' to refer to the day you gave it, is too early to ask about an opinion.

I am trying to think of example questions for when the time is right, but honestly any question I come up with can come across as pushy depending on the person. So I get your worry