Plant them now. You can use the jiffy pellets, I have used those before with seeds started the same way. BUT... I have noticed that those I start with peat pellets tend to get mold much more easily than those I put into plastic 6-packs filled with seed starting mix. If you do choose to go with the pellets make sure you have good air circulation, don't over water (shouldn't do that anyway!), and have some cinnamon on hand ready to sprinkle on at the first sign of mold.

Good Luck!