Saving tip for the future. To access your remote sever (DB server in this case) over a SSH tunnel, few steps needed:
1. Create/edit ~/.ssh/config
Add following to proxy all connections using the jump server to host foo
ProxyCommand ssh email@example.com exec nc %h %p 2> /dev/null
2. Create tunnel to target on port 3306 which will appear as 7777 on localhost
ssh -C -L 7777:target.remote.com:3306 firstname.lastname@example.org dstat 10
3. Use SQL developer/workbench to now connect to localhost 7777
foo and remote could be same or different server above.