H1 got approved on 19th DEC 2016 but forgot to apply H4

  1. COS from OPT to H1 was recently approved on 17 DEC 2016 and my OPT is still valid till April 2017? if i apply H4 today will it be out of status?

  2. After H1 got approved , with in what time i can apply H4 dependent?

  3. What all documents need to apply for H4? what is fee amount?

4.How much time will it take transfer from F2 to H4?