Yes you can place Pyrex Glass Bowls in an oven but if the Pyrex was in the refrigerator I would let it sit out for at least 10 minutes at room temperature before putting it in the oven.
That would give enough time to preheat the oven beforehand anyway which is recommended.
You can put the Pyrex directly from cold to the oven but I wouldn't risk it as anything could happen so I just wait at least 10 minutes to allow the Pyrex bowl to warm up a bit before putting it in the oven.
Doing that I've never had a problem even though it's supposed to be safe to put the Pyrex directly into the oven.