Both the T-34 and KV-1 tanks were available in small numbers. IIRC the Soviets had 400 to 500 T-34 and around 300 KV-1 in the field.IIRC, the T-34 tank was available, in the first production version, but in small numbers at the time of the start of Barbarossa.
About September 1940 saw the first production models.
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T-34 - Wikipedia
en.wikipedia.org
One strategically placed T-34 halted Army Group Center for an entire day.
4 guys stopped over 200,000!