The first chapter made me laugh, the other two are cute and somewhat interesting to watch due to the unexpected outcomes, but I wouldn't consider it that funny.
This OVA chronologically might take place after the end of the anime, and it's new content not present in the manga. Still, being released before the main series and being titled Episode 0 makes it suggestive it doesn't matter the order you decide to watch it.
If you want to dig into Nichijou or have already watched it and crave more, I think it's worth watching. It's not a bad episode, it's well directed, but some people might find it boring.
