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.
Leverkusen started the season badly so that they lost several points, but now the squad coached by Xabi Alanso seems to have found their identity again, we can see as you have said, the squad coached by Xabi Alanso has always won in the last 8 matches. Leverkusen's current revival of course makes Bayern Munich no longer feel safe at the top of the standings because they are only four points behind, with the season still long of course the opportunity to overtake Bayern Munich is still wide open.
However, even though they are currently only four points behind, Leverkusen should not be happy yet because in the next match they will face a tough match which is having to travel to Dortmund while Bayern Munich will travel to Borussia Mönchengladbach. Leverkusen and Bayern Munich have the potential to lose points in this match if they make a small mistake because of course the host will also fight to get points in order to improve the standings. So it is very true as you said, for now there is no team that dominates the Bundesliga because both Leverkusen and Bayern Munich have the same opportunity.