set a wait in between commands in a RMAN script

 Hi

I need to put  a wait between  'sql "ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL";' and 'RESYNC CATALOG FROM DB_UNIQUE_NAME ALL;' in the below given script. 

Please advice me how to do it?

run

{

sql "ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL";

RESYNC CATALOG FROM DB_UNIQUE_NAME ALL;

backup database plus archivelog;

delete noprompt archivelog all completed before 'sysdate -7';

backup current controlfile;

sql "ALTER DATABASE RECOVER MANAGED STANDBY DATABASE  THROUGH ALL SWITCHOVER DISCONNECT  USING CURRENT LOGFILE";

}