Billy,
If you just added metabilsulfite, you should be fine. It prevents growing of bacteria and wild yeast, but does not harm cultured yeast. If you do wine from grapes you usually add it in must to kill everything in it and then add yeast and it does not stop them from fermenting. If you, however, added sorbate, you may have problems. Although, it does not kill the yeast, it seriously weakens their function and prevents them from multiplying. But even then there should be enough yeast to finish it. It may just take a bit more time.
Wookey