On OpenVPN we do not have today no wait time after the VPN is ready. I see this we need for at least one customer since it's taking so long time to get all the routes up after the VPN is up and running.
I think you can copy this function from the Cisco Anyconnect plugin.
Ingvar Orn Ingolfsson
Axdata AS - Norway
I will enter a feature request. We will have to verify if it's possible. We are not the original developer of this add-on