Top 50 CPU Consuming Queries in SQL Server

Select 
     st.[text] AS [Query Text],          
     wt.last_execution_time AS [Last Execution Time],
     wt.execution_count AS [Execution Count],
     wt.total_worker_time/1000000 AS [Total CPU Time(second)],
     wt.total_worker_time/wt.execution_count/1000 AS [Average CPU Time(milisecond)],
     qp.query_plan,
     DB_NAME(st.dbid) AS [Database Name]
from 
    (select top 50 
          qs.last_execution_time,
          qs.execution_count,
   qs.plan_handle, 
          qs.total_worker_time
    from sys.dm_exec_query_stats qs
    order by qs.total_worker_time desc) wt
cross apply sys.dm_exec_sql_text(plan_handle) st
cross apply sys.dm_exec_query_plan(plan_handle) qp
order by wt.total_worker_time desc

Top 50 Disk IO Consuming Queries in SQL Server

select 
     st.[text] AS [Query Text],      
     qs.last_execution_time AS [Last Execution Time],
     qs.execution_count AS [Execution Count],
     qs.total_logical_reads AS [Total Logical Read],
     qs.total_logical_reads/execution_count AS [Average Logical Read],
     qs.total_worker_time/1000000 AS [Total CPU Time(second)],
     qs.total_worker_time/qs.execution_count/1000 AS [Average CPU Time(milisecond)],
     qp.query_plan AS [Execution Plan],
     DB_NAME(st.dbid) AS [Database Name]
from 
    (select top 50 
          qs.last_execution_time,
          qs.execution_count,
      qs.plan_handle, 
          qs.total_worker_time,
          qs.total_logical_reads
    from sys.dm_exec_query_stats qs
    order by qs.total_worker_time desc) qs
cross apply sys.dm_exec_sql_text(plan_handle) st
cross apply sys.dm_exec_query_plan(plan_handle) qp
order by qs.total_logical_reads desc

refer:

https://dbtut.com/index.php/2019/04/19/how-to-find-most-expensive-queries-in-sql-server/

https://www.tutorialspoint.com/ms_sql_server/ms_sql_server_architecture.htm