When dough is finished chilling, put on a lightly floured work surface, and roll out the dough to a 12-inch round. Line a rimmed baking sheet with parchment paper. Transfer the dough to the baking sheet. Mound the plums and raspberry mixture into the center of the dough, leaving a 2-inch border all around. Don't worry about arranging them all pretty. Fold the edge of the dough up and over the peaches. Cover with plastic wrap and refrigerate the tart until chilled, 30 minutes.
Preheat oven to 425℉. When tart is finished chilling, brush the edges with the heavy cream, sprinkle the edges with the coarse sugar, and sprinkle with almonds, pressing them in gently to adhere. Bake for about 30-35 minutes until golden and bubbly, being careful not to burn the almonds. Let cool for 15 minutes before cutting and serving.