Preheat oven to 375°. Arrange bread slices in a single layer on a rimmed baking sheet; brush top of each slice with olive oil. Bake 8 to 10 minutes or until toasted.
Combine cream cheese, lemon zest and juice, salt, and 2 tablespoons dill.
Spread cream cheese mixture evenly over toasts. Top each toast with 2 cucumber slices, pressing gently into cream cheese mixture.
Arrange smoked salmon evenly over cucumbers.
Sprinkle toasts evenly with black pepper and remaining dill.