Follow-to-Join for wife and daughter

[nrocky]

I am an LPR who got his immigrant visa in F-4 category through my sibling. The visa was issued in March 2016 and i eneterd USA in August 2016. Received my Green card in September. At the time of processing of the case at NVC, we had to put my wife and minor daughter, who were listed as derivatives on the original petition, as "follow to join", since they were not ready to immigrate at that time due to some family commitments. Immigrant visa fees however had been paid for them but DS-260 was not filled as online access to DS260 was blocked by NVC as soon as they were listed as follow to join.

Wife and daughter are now ready to immigrate. 

My question is do i need to file an I-824 for them or they would be scheduled for interview directly by the New Delhi US Embassy which handled my case. I spoke to NVC yesterday and they said that the case had been transferred to New Delhi embassy in February and that they have no role to play now.

Please guide my how to proceed forward from this point onwards