The official also pointed out that significant progress had been made in bilateral talks since July, when the two countries reopened embassies.
During negotiations in Havana last week, the sides planned to normalize relations between the countries in full within 15 months.
According to a so-called “pilot” postal program, citizens of both the US and Cuba will be able to send and receive letters and packages directly to one another for the first time since 1963. For decades, mail traveling between Cuba and the United States had to travel through other countries like Mexico, Panama and Canada.
The US has said it will issue new rules that would allow Americans to visit the island nation and open businesses there.
The two countries have achieved progress in several other important spheres this year as well.
For instance, American and Cuban drug control agencies are about to start collaborative work. In addition, environmental scientists including those from the National Oceanic and Atmospheric Administration have joint work planned.
Although the embargo on Cuba has yet to be lifted, a move only possible by way of a congressional ruling, authorities have pledged to complete the normalization of relations between the states before President Obama leaves office in January 2017.