Rac Primary and Standby

Hi Gurus,

I have 11203 2-node RAC primary and 2-node RAC standby (Active dataguard) running on same server and sharing OH(Oracle Home).I need to apply July PSU patch on it. Please let me know if the below steps are correct.

Primary db:PrmyA

Standby db:StdbyA

On Node 1

1)Switch apply instance to node2

2)stop CRS on node1

3)Apply PSU

4)Start CRS on node1

On Node 2:

1)Switch apply instance to node1

2)stop CRS on node2

3)Apply PSU

4)Start CRS on node2

5)Stop Apply and Mount standby DB.

6)run Post Patch scripts catpsu.sql

7)Open standby read only and start MRP