When your case is finally approved it will be first transferred to New Hampshire and then to the Embassy in the alien’s country.

The NVPC will note the approval of the petition and determine whether or not an actual visa is available for the beneficiary (alien fiancé (e)). With the exception of spouses, fiancé (e) s, parents and children of US citizens, all other family visas are subject to annual quotas. When these quotas are reached no further visas can be issued until new quotas are available. For many beneficiaries the wait can be years. For the above list of immediate family members and fiancé (e) s there are no quotas so these cases should clear NVPC processing very quickly before being sent to the Embassy for visa issuance.

K1 Fiance Visa Guide