History / Alternative History of August 1939 and Thereafter [11]

So glad to find y'all here !
Who better to help me dope this out?

Let me ask two things of you.
First, suspend your disbelief.

Okay, done that?
Then next ... suppose it is, say, August 1, 1939.
Hitler has been diplomatically rampaging through central Europe.
Prague fell in the spring - without a shot being fired.
German forces surround Poland on 3 sides.

Colonel Beck finally decides that Polska's up next.
He gets the Brits and France to guarantee Poland's integrity and independence.
But you know all that already.

Suppose, though ... that Hitler, a man of astonishing abilities and capacity, along with his diabolical malevolence ...
managed to foresee a glimpse of the future course, conduct, and consequences of his new war
... especially in the East.

Suppose he decided to back off from attacking Poland a month later?
Would he have even bothered with the Soviet pact?
Would Stalin have started the war a year or two later?
Could the rule of the colonels in Poland have continued indefinitely?

How would history have taken it from there?

Thanks for your helpful thoughts !