It can be useful as part of viva prep to read your examiners’ recent publications. A little time invested exploring their recent work can help give a little perspective on their research interests, the questions, methods and topics they are focussed on or just tell you a little more about them.
You don’t need to read everything. You don’t need to include them in your thesis (unless of course there is a really good reason to). You don’t need to become an expert in what they do, because you’re an expert in what you do.
With the right framing, an hour or two of reading could give you a little boost for how you feel about engaging with your internal and external in the viva. What they wrote helps you to see what they do. What they do helps you to reflect on what might be coming up in your viva.