The recipe breaks down as follows: 1) Instructions on separating the eggs, then set them aside while you make the basic cake. 2) Instructions for the cake, ending with “Divide the batter…Set aside.” 3) Instructions for the meringue. I would NOT diverge from the recipe so far as to change the baking instructions. Meringue is a very unique substance, and if you’ve never worked with it before, maybe you should choose a different recipe. The Meringue should not sink into the cake, nor prevent it from cooking. Meringue is not like whipped cream, and it’s neither exactly liquid nor solid, it’s a very special substance. You should NOT serve the meringue unbaked, that’s not how it works. Meringue needs to be baked before you eat it, it’s not like whipped cream. Follow the recipe or choose a different one. Let us know how it turns out.