Current Week ==>First day of the week :
SELECT CONVERT(VARCHAR(10),(DATEADD(DAY,-((DATEPART(DW, (DATEADD(WK, 0, GETDATE()))))-1),((DATEADD(WK,0,GETDATE()))))),120) AS [Current_Week_FirstDay]

Current Week ==> Last day of the week
SELECT CONVERT(VARCHAR(10),(DATEADD(DAY,7-((DATEPART(DW, (DATEADD(WK, 0, GETDATE()))))),((DATEADD(WK,0,GETDATE()))))),120)...