Database migration 9.2(sun) to 11.2(AIX)

Dear Experts, Need your advise, We've to migrate  data(3 TB) from 9.2 2-node rac to 11.2 rac 

9.2 rac currently has a standby database(standalone)

Following is my approach(summarized) :

1.Do necessary setup including installation in 9.2 and 11.2 servers.

2.Identify tables,enable suppl logging, etc

3.Start extract on node1 of 9.2 rac

4.Startup datapump extract on node1 o 9.2 rac

5.Open 9.2standby databae in RO mode

6.Select first_change# next_change# from v$archived_log where sequence#= <last al sequence applied to standby db>

7.Export tables,schemas from standby db

8.Import dmp ( from step 7) into 11.2

9.Start replicat in 11.2 astscn <next_change#>( from step 6)