alert when CPU usage is High in SQL SERVER

IF OBJECT_ID('tempdb..#TABLEHIGHCPU') IS NOT NULL DROP TABLE #TABLEHIGHCPU;

CREATE TABLE #TABLEHIGHCPU
(
C1 INT,
C2 INT
);
DECLARE @i INT = 1;
WHILE (@i <= 12) -- Set Run time here; Value 6= 1 min (6x10sec)
BEGIN
INSERT INTO #TABLEHIGHCPU
SELECT cntr_value AS C1, (SELECT cntr_value
FROM sys.dm_os_performance_counters WITH(NOLOCK)
WHERE object_name = 'SQLServer:Resource Pool Stats' AND counter_name = 'CPU usage % base' AND instance_name = 'default'
) AS C2
FROM sys.dm_os_performance_counters WITH(NOLOCK)
WHERE object_name = 'SQLServer:Resource Pool Stats' AND counter_name ='CPU usage %' AND instance_name = 'default'
WAITFOR DELAY '00:00:10' -- Set value for Delay in execution
SET @i = @i + 1;
END

DECLARE @CPU INT
SET @CPU = 50 -- Set CPU Threshold here

IF @CPU < (SELECT AVG(C1) * 100 / AVG(C2)
FROM #TABLEHIGHCPU)
SELECT 'ALERT HIGH CPU!!!';--Replace it with your sp_send_dbmail statement here

ELSE
SELECT 'CPU USAGE IS NORMAL';

select AVG(C1) * 100 / AVG(C2) [AVG CPU %] FROM #TABLEHIGHCPU;