Check Case Status Picklist Values Marked as 'Closed' Or Not In Apex

In Order to retrieve the Case Status Picklist Values we have Standard Salesforce object "CaseStatus".
CaseStatus object represents a value in the case status picklist. Query the CaseStatus object to retrieve the set of values in the case status picklist.


Demo:

SELECT Id, isClosed, MasterLabel FROM CaseStatus WHERE IsClosed = true

Check Bellow ScreenShot For More Information.

For Reference
CaseStatus Api ReferenceHappy Learning!!!