If you watched the movies but you are not a die-hard fan: Nope it's not worth reading them especially because unlike the movies the book has tons of trivial characters and events that make things boring. Especially reading the series past the 2nd book was too boring due to its unnecessary length, so especially Goblet of Fire is boring AF. The writer wrote like she just loves to wrestle with words to make things sound too fancy and make more money by writing more words. And then Order of the Phoenix is boring AF too until around the end. If you don't care about Harry Potter universe that much the only book in the series okay to read is Harry Potter and the Half-Blood Prince.
If you never watched the movies, the movies suck AF so better read its books instead though. The movies doesn't worth at all while all the point of the Harry Potter story is in the book.
If you loved the movies and want more the movies are like a significantly reduced version of the books. There are more significant characters and events to learn in the books, while the movies only focus on what characters and events matter for the entirety of the storyline, but sometimes shit changed in a bad way just for stupid movie logic to cause unnecessary drama and "positive moments" by following generic shit they follow to produce movies. For example the movies lacks a very important fun character da Peeves the Poltergeist and it is like ignoring the existence of Tom Bombadil in Lord of the Rings movie just to reduce the costs of SFX lol. These characters are not unnecessary in their respective universes so their absence in the movies are a dick move. Actually whole existence of Peeves the Poltergeist is fundamental for the main big deal story point in Order of the Phoenix that the story too changed in the movie adaptation and makes shit doesn't really make sense. I wish Hermione hadn't existed instead lol. Oh, in the books Hermione is not part of the Harry-Ron gang, but in the movies from the start it seems like she is die hard friend or something. In the book Hermione's existence is like the writer's mind leaking to her pencil because she was like "boys are stupid so this story needs a Mary Sue character to make these stupid boys do something right" by from time to time Hermione shows up and saves the day while Harry and Ron are annoyed by her presence. IDK why movie versions removed this relationship dynamic. And then the book Hermione is not that "good" compared to the movie version, she doesn't even fix Harry's glasses or something. While book Hermione is Mary Sue the movie version is woke lol. I'm actually surprised in the movie Hermione cannot defeat Voldemort as soon as she sets foot in the school lolol. In the end either in the books or the movies existence of Hermione makes the whole story stupid by making the story rely so much on "deus ex machine card".
Those who liked the movies, however, may feel weird reading the books because how things happen differently and how characters are different too. Mostly so many characters from books merged into one character in the movie so as what multiple characters separately did in the books done by one and only character in the movie adaptation, sometimes roles are even switched. It may make movie enjoyers actually dislike the movies. And then the movies have events that never happened in the book so people may like the movie for extra events that happened so they would dislike the books that these events never happened compared the books.
As a result the book version is significantly different "the true" version while the movie versions are too different and a "distorted parallel universe" version. In the end despite the book version is boring the whole story makes more sense in the book series compared to the movie version. Otherwise they both suffer from same reasons in terms of unrealistic male characters and the whole key story points. It's just book versions suck less and have better good things to enjoy while the movie adaptation is just visuals and boring aspects of the story that story progression happens wrongly and therefore doesn't make sense from time to time. Clearly they only cared to make the movie versions enjoyable by people who already read the books and the people who don't care about the Harry Potter story, they just wanna watch a movie that is done in a "watchable" way.
In the end "worth" is subjective, but in general Harry Potter books doesn't add anything to you and it is not a significant book I would recommend to anyone. Better read Neuromancer by William Gibson instead!!! lolol