What do I need to know?
utc_offset, which is returned on Place Details requests and
opening_hours.open_now, by the isOpen() method in Place Details requests only.
What do I need to do?
Before November 20, 2020, follow the Place Field Migration guide to make the necessary property and method substitutions and to see the alternative options for obtaining opening_hours data to prevent user experience degradation. Google has also recently published a video explaining how to get current open status through Place Details using the isOpen method and utc_offset_minutes field.