Converting 19c Stand alone DB to RAC

Hi

We have this requirement to convert our single standby database server into a RAC Standby

The primary database is a 2 node RAC - Lets say Nodes as PRIM-1 and PRIM-2

Standby is running as single instance on node STDBY-1 and we need to add the second instance on node STDBY-2

This is 19c Database on Linux

We are trying to come up with the steps to accomplish that and would appreciate if we can get some guidance on this

Here is what we think we would need to do 

Kindly let us know if we are missing anything or any aspect we need to add/edit/remove