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Google My Business offers support options on their web site and now it may even show you the hours of operation for those support channels. Here is a screen shot from Usama Ali on Twitter showing this support feature.
On the Google My Business support page, after you are able to reach out and contact a support rep, it may show you the hours of operations box:
You can see the support hours for each method based on today, tomorrow or the next day, as well as "show all" times, plus it shows the timezone.
I guess this is useful when you need support and you are not on the same timezone as the Google support reps.
Forum discussion at Twitter.
