By now the starter should be doubled in size and should have lots of big and small bubbles. The starter should be active, bubbly, and the texture should be spongy. The starter shouldn't smell. If this is the case than your sourdough starter is ready to use! Lastly you can name your starter if you'd like. TIP: Transfer the starter to a clean jar if the jar you are using is very crusty. Keep your jar as clean as possible.