Yes. You are correct. Forging isn't available at the moment. The forge was closed due to high ETH fees. They have updated Forge and more stuff coming in the next couple of months. You will be able to forge your cards when the forge - reopens and then list them on the market if you would like to sell them. If you play on weekend ranked, you get packs which are already NFT's and you can sell those on the market right away.