Assuming that Poland is conquered but the French and British dont declare war against Germany and sit tight. Now Hitler prepares to launch everything against the USSR in May 1940.
Because Hitler is not at war with GB+France Stalin finally realises that he is next on the list. So there is no invasion of Finnland and Soviet troops are on full alert.
On May 10th 1940 the USSR is attacked by 141 Divisions with
3 350 000 soldiers, 7378 guns, 2445 tanks and 3578 aircraft.
Thats the same amount of troops and material that has been used in the Western campaing in OTL.
The German troop strenght is roughly the same as in OTL Barbarossa as is the amount of guns.
In this ATL Germany has 1000 tanks less but 1000 aircraft more than in OTL Barbarossa.
Because there was one year less time to prepare and produce the USSR has thousands of tanks, guns, and planes less than in OTL, hundreds of thousands of soldier less than in OTL and the first T-34 tanks wont be ready for months.
On the other hand Soviet troops were on full alert and the losses in the first days of the attack were far less than in OTL.
So is this a better scenario for Germany or a worse one ?