It's hard to really say much or little. At the beginning of the season everyone wrote Leverkusen off, but now they are four points behind Bayern. Only half of the season has passed and if Liverkusen remain stable, then we can start to think that it is dangerous for Bayern, but now I agree with you that they are very far from the first place, Bayer play a lot of draws.
From what I have witnessed recently, Leverkusen has been very consistent and has won consecutively in the last 8 matches and currently Leverkusen is quite clearly chasing Bayern Munich even though they were previously quite far behind but now their points difference is only 4 points while Bayern Munich in their last 5 matches has lost 4 points meaning Leverkusen still has a chance to overtake Bayern Munich if this club makes a mistake because the journey is still very long, both Leverkusen and Bayern Munich still have the same chance.