Well, the documentation states that these new columns were added from SQL 2016.  However, they are available in my SQL 2014 instance.


SELECT @@VERSION;


Microsoft SQL Server 2014 (SP2-GDR) (KB3194714) - 12.0.5203.0 (X64)
    Sep 23 2016 18:13:56
    Copyright (c) Microsoft Corporation
    Developer Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1)



select
  total_dop
, total_reserved_threads
, total_grant_kb
from sys.dm_exec_query_stats;


total_dop    total_reserved_threads    total_grant_kb
3    0    3072
1    0    1872
1    0    1024