I am trying to fetch the logged in user timezone as below
TimeZoneManager.getLoggedInUserTimeZone() , but it is throwing below error
No signature of method: static com.atlassian.jira.timezone.TimeZoneManager.getLoggedInUserTimeZone() is applicable for argument types: () values: 
Does anyone have idea on resolving this
Seems like the TimeZoneManager does not have a static method like that. You should get an instance of the TimeZoneManager, something like this:
ApplicationUser user = ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser()
TimeZoneManager timeZoneManager = ComponentAccessor.getComponent(TimeZoneManager.class)
Let me know if this works!
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