In the beginning of ?????? ???? ????? it says ????? ???? ??? ??? that Hashem retrospectively brought forward the gift of ???. The ?????? explain this to mean that Moshe arranged with Paraoh to davka be given shabbos off, even before ???, in spite of the fact that a lot of ????? had yet to be given.
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The answer to the mon is from rashi in shmos 16:1 who says on the pasuk that they arrived in midbar sin on 15th of the second month: that this stop in the desert was because the food that they had brought with them from mitzraim ended and they now needed mon, which teaches us that they ate remains of the dough for 61 meals.
And the Ramban says they now complained of lack of food, and it was a miracle that they were all fed on relatively small amounts of food for so long.