I do not think Russia was ready to invade. Here is what i gather from four wars before Germany invaded them.
Spain
This gave Russia a change to try out their new tanks and aircrafts. The tanks was a disappointing and aircraft did not fair much either. However, the Russians blame the mountain terrain for the poor performance of the equipment and air power has greatly advanced since WWI, but they did gain something that help them out. 1) decided to build a dedicated ground attack aircraft (Il-2) and they formed armed divisions or "corps".
Manchuria
Russian fought a serious of battles with the Japs. This was a point that Russia used hundredths of tanks in the battlefield and decisively defeated the Jap army. This buildup confidence for the Russia. NOTE: Here is where Hitler ignore Jap help. Hitler was gambling on Japaness to invade Russia on the east. He should have looked at the results of Manchuria. The Japs used the battles in Manchuria as a field test of thier army's ability. They really had no attentions to invade Russia, but to see where they need to improve battlefield tactics.
Poland
Russia had plans to invade Poland after signed the alliance act with Germnay. However, they did not expected that Germany would have overtaken Poland so fast so the Russian offensive was hastily organized affair. It was a messy plan as the Rusians troops where not train as hard as the Germans. Thier advancement was disorganized and if any Poland resistance was there, the Russians they may have been stopped cold. Due to the ugly victory, Russian decided to disbanned the tank corps and tank battalions distributed among the infantry unites.
Findland
Another disaster for Russia. After the armistice, Russia know then that it was back to the basic and needed to improve the training.
France
Even though Russia had nothing to do with France, they stood on the sidelines and observed Germany Army. At first, they thought that the battle would be a stalemate. However, after the fast Germany victory with panzer divisions. Russian looked at bring back tank divisions. There were a few things that have change too. Officers where given more authority, political commissars where given less ability to over looked every units and like the Germany, the Russian air force primary mission was to direct support of ground forces.
General Zhukov insisted that "lightning war" would not be the key to victory. He knew, along a few high ranking officials that Germany will invade Russia. However, despite having more troops, tanks and aircraft, Russian was not train ready to attack Germany or fighting off a possible invasion from Germany. Also, Russian weapons are a bit out of date and Stalins paranoia of his staff he purged about 67% of the generals in the Army: 3 of 5 marshals, all 11 vice commissars of war, 75 of the 80 member of the Supreme War Council, 13 of 15 army CO, 51 of 85 corps commanders and 110 of 195 division and brigade commanders.
In all, I do not think Russia had no plans to invade Germany.