Yes. The initial cost of the trade is a credit equal to the price per call multiplied by the number of calls you sold. This is the maximum you can make. Your risk on the other hand is theoretically unlimited, because the price of the underlying is theoretically uncapped.

That's when you sell a naked call. If you instead sell a covered call, you keep 100 * the number of calls sold in your account as collateral. Then you still only receive an exact credit at the time the position opens, but your risk is capped and defined as the price of the collateral at the time the position opened.