How do i analyse query performance ?

Declare @count int=0;
;with CTE(RM_PART_NO ,FG_PART_NO,LEVEL)
as
(
select RM_PART_NO ,FG_PART_NO,0 as LEVEL from BOM_MASTER (nolock) where FG_PART_NO='29049260' and WH_CODE='0021'
union all
select BOM.RM_PART_NO, CTE.RM_PART_NO,LEVEL+1 from CTE as CTE inner join BOM_MASTER BOM  (nolock) on BOM.FG_PART_NO=CTE.RM_PART_NO where WH_CODE='0021'
)
select @count=count(RM_PART_NO) From CTE where RM_PART_NO=( SELECT SEWS_PART_NO FROM PRODUCT_MASTER with(nolock) WHERE ITEM_NO = ( SELECT ITEM_NO
FROM INV_SERIAL with(nolock) WHERE SERIAL_NO = 'BA00586147' )) group by CTE.LEVEL  order by LEVEL  option(maxrecursion 0) 
if (@count=0)
begin
select 'FG & RM PART MISMATCH '
end

Declare @count int=0;
;with CTE(RM_PART_NO ,FG_PART_NO,LEVEL)
as
(
select RM_PART_NO ,FG_PART_NO,0 as LEVEL from BOM_MASTER (nolock) where FG_PART_NO='29049260' and WH_CODE='0021'
union all
select BOM.RM_PART_NO, CTE.RM_PART_NO,LEVEL+1 from CTE as CTE inner join BOM_MASTER BOM  (nolock) on BOM.FG_PART_NO=CTE.RM_PART_NO where WH_CODE='0021'
)
select @count=count(RM_PART_NO) From CTE CTE inner join PRODUCT_MASTER pm (nolock) on CTE.RM_PART_NO=pm.SEWS_PART_NO inner join INV_SERIAL iv (nolock) on pm.ITEM_NO=iv.ITEM_NO where iv.serial_NO='BA00586147'  group by CTE.LEVEL  order by LEVEL  option(maxrecursion 0) 
if (@count=0)
begin
select 'FG & RM PART MISMATCH '
end