Yes. Campden Tablets is Potassium Metabisulfite, or K-Meta (K being the symbol for Potassium).
Typically, you will add 1/4 tsp worth of K-meta (about 4 campden tablets), per 6 gallons of wine, at the end of fermentation, and with each racking (1 month, and every 3 months thereafter), including right before bottling.
When bottling, I typically rack, and add K-meta. Then I let it sit for a day to a week before actually bottling. the idea being giving the k-meta time to disperse.