if your have sql 2008 or newer version, then

CREATE EVENT SESSION [Monitor Update Stats ] ON SERVER

ADD EVENT sqlserver.sql_statement_completed(

ACTION(sqlos.task_time,sqlserver.database_id,sqlserver.database_name,sqlserver.sql_text,sqlserver.transaction_sequence,

sqlserver.tsql_frame,sqlserver.tsql_stack)

WHERE ([sqlserver].[like_i_sql_unicode_string]([sqlserver].[sql_text],N'%update%statistics%')))

ADD TARGET package0.event_file(SET filename=N'd:\Monitor Update Stats .xel')

WITH (MAX_MEMORY=4096 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,MAX_DISPATCH_LATENCY=30 SECONDS,

MAX_EVENT_SIZE=0 KB,MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=OFF,STARTUP_STATE=ON)

GO