If by "update" you mean "information about the actual date," yes, I think you are entitled to an update about the date.
But I think you don't ask until you get into "time to send an invitation" territory, which is about 6 weeks out. So yes, now you can ask them what their plans are.
In fact, I personally think they have an obligation to tell you if anything has changed. I received an StD from a cousin, and I was seriously looking into plane flights. I mentioned to my mom that I wondered if i should rent a car as well, or could she cart me around with her (since she would be driving), and she said, "I don't think that wedding is happening."
I never did hear from the bride that it wasn't going to happen at that time.
I waited a week and then contacted her mother to ask, and was told that it was cancelled.
In this case, w/ a pandemic going on, personally, I would simply not ask, because I would not be going. Period.
"As of May 15, a total of 231 of 3,143 counties had no reported cases. The list is getting shorter by the day, though. In the first half of May alone, 40 counties went from zero recorded cases of the virus to at least one."
https://www.usatoday.com/in-depth/news/2020/05/17/coronavirus-free-rural-counties-low-testing-and-population-density/5196441002/Weddings are super-spreader events. They pull people from several different geographic regions, and people hug one another, etc.
However, if you think you MIGHT go, or might go under certain circumstances, then absolutely, at 6 to 8 weeks ahead of the date, you are totally OK to touch base and say, "I'm wondering if anything has changed due to the pandemic."