Using an immersion blender, combine the prepared peaches, sugar, lemon juice, and salt (if using) until very smooth and no more chunk of peaches remain. Alternatively, use a blender or food processor to combine everything.
For the best results, chill the sorbet base until cold, at least 4 hours or ideally overnight.
Pour the sorbet base into an ice cream maker and churn according to manufacturer's instructions. Once a smooth, soft-serve consistency is reached and the mixture has lightened in color, pour the mixture into a loaf pan or ice cream container. Smooth the surface of the sorbet, cover with plastic wrap, and immediately freeze for at least 4 hours. Once firm, scoop and enjoy!