1
do not believe it is possible, in any case you will achieve the same result by manipulating two variables.
DECLARE @ExecInicio DATETIME2(7)
DECLARE @ExecTermino DATETIME2(7)
SET @ExecInicio = sysdatetime();
-- MinhaQuery
SET @ExecTermino = sysdatetime();
SELECT DATEDIFF(SECOND, @ExecInicio, @ExecTermino) -- segundos.