Place sliced peaches, strawberries, and ginger in large pitcher. Pour in wine. Add limoncello and stir in sugar. Cover pitcher and let chill in the fridge for at least 3 hours (overnight is best).
Right before serving, pour in ginger ale. Serve sangria chilled. Garnish with sliced lemon and fresh thyme, if desired.
Notes
*Note: As the strawberries steep in the sangria, they will lose their bright red color. Add additional sliced strawberries right before serving to amp up the colors of the sangria.