This is a 10 book series. The 10th book was published in 1991, and Zelazny died in 1995. He wrote a handful of related short stories. The last of those was published around 2005.
The author's estate authorized a prequel series written by John Gregory Betancourt. These are not generally considered canon. Even if they were, the most recent of those was published in 2005.
Chronicles of Amber - Roger Zelazny
The author's estate authorized a prequel series written by John Gregory Betancourt. These are not generally considered canon. Even if they were, the most recent of those was published in 2005.
I got the exact dates from the Wikipedia article on The Chronicles of Amber: https://en.wikipedia.org/wiki/The_Chronicles_of_Amber