Many updates are taking considerably longer than normal.

Source: searchengineland.com
During this time of crisis, it’s so important for local businesses and companies to make sure they are keeping all of their channels, including their Google My Business listing, up to date with special hours, contact information and posts to keep their community informed of any changes or updates.
This was the advice laid out by Google recently, but now the listing service is experiencing delays and functionality issues as local businesses and companies have been flooding the site and Google’s own staff is reduced. As a result, Google temporarily disabled new local reviews, as well as the ability to post responses, in an attempt to mitigate the problem.
Remember to also update other channels such as your website, social media and local listings to ensure the information is accessible.