Are you AP/CP? Generally, the application process for most fellowships starts about 2 years prior to fellowship start date. But interviews sometimes don't happen until about 18 months prior, depending on the program. Basically, the entire process blows and is wildly inconsistent (with regards to timeline and expectations) from program to program, and even within a program from year to year. The best advice is to contact the program and ask them their specific instructions (don't rely solely on their website).
But I would think that most programs would not have decided on their fellow more than 2 years prior to the start date.