Would not have mattered. The only help they could provide was for the French army to advance into German territory and the French were not willing to do that. Had the Soviets not invaded, Poland might have lasted another few days at most. But the Soviets would not have liked having German troops on a border so far to the east. They wanted more buffer space in the west so they were driven to cooperate in the destruction of Poland.
“The only help they could provide was for the French army to advance into German territory and the French were not willing to do that.”
The French Frontier was held by only seven divisions of German troops during the invasion of Poland.
But France was paralyzed by internal dissent and political unrest, an antiwar fervor from the aftermath of WW1, and the leadership was confident that the incredibly expensive Maginot Line would protect France from Germany.