how to find time of most expensive stored procedures

I can trace the most expensive queries using this query

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
SELECT TOP 100
CAST((qs.total_elapsed_time / 1000000.0) AS DECIMAL(28,2)) as total_elapsed_time,
CAST((qs.total_worker_time) / 1000000.0 AS DECIMAL(28,2))
AS [Total CPU time (s)]
, CAST(qs.total_worker_time * 100.0 / qs.total_elapsed_time
AS DECIMAL(28,2)) AS [% CPU]
, CAST((qs.total_elapsed_time - qs.total_worker_time)* 100.0 /
qs.total_elapsed_time AS DECIMAL(28, 2)) AS [% Waiting], qs.execution_count
, CAST((qs.total_worker_time) / 1000000.0
/ qs.execution_count AS DECIMAL(28, 2)) AS [CPU time average (s)]
, SUBSTRING (qt.text,(qs.statement_start_offset/2) + 1,
((CASE WHEN qs.statement_end_offset = -1
THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2
ELSE qs.statement_end_offset
END - qs.statement_start_offset)/2) + 1) AS [Individual Query]
, qt.text AS [Parent Query]
, DB_NAME(qt.dbid) AS DatabaseName
, qp.query_plan

FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
WHERE qs.total_elapsed_time > 0
ORDER BY [CPU time average (s)] DESC

but i cant find the date and time they ran? Any help

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k