NT here. Usually, it's more or less whatever.
What has been going on lately, are you working on something specific? What're your hobbies like, etc.
It depends on familiarity with that person, and it depends on what I think that person would be into. I'd love to grok out over games I've played recently, but not everyone is into that, so I assess the situation first. My wife is also NT and she's mostly the same. She wants to grok out over all her pencils, markers, paints and other art stuff.
I usually keep the grokking out to my youtube channel :P
I guess you could classify these things as "small talk", but I like knowing what my friends are doing and what's going on in their lives.
I saw someone else mention they talk mostly about other people, but I don't necessarily do that too much. At least not in the gossipy way.
If you have any more questions, hit me up :)

I recently replayed Metal Gear Rising, and when Armstrong kept talking about how much of a pussy America has become and started yelling that with him at the helm, he'd MAKE AMERICA GREAT AGAIN, I was fucking shocked.
Granted, I know that term was an old Reagan term, but fuck, with Metal Gear Solid 2 (2001) being all about the internet flooding with misinformation and AI making it so that you don't truly know who you're talking with... And with Rising (2013) being about a dude thinking America is too woke and wanting to make it great again... AND WITH DEATH STRANDING (2019) being all about everyone being locked inside their homes, isolated with little physical connection to their friends and families, only waiting for the mailman to arrive with packages...
Whew, if I had to point out a person I suspect may have a functioning time machine, Kojima might be it..