Bayern Munich are ahead of the Leverkusen not mean that their safe at the top of standing, remember that Leverkusen performance was not powerful when the season get started; they performed very poorly at the beginning of the league, but indeed with their much efforts they where able to claimed the 2nd position in the table.
The fact’s is that I have confidence on the Leverkusen that they can do everything possible to take over the Bayern Munich from the top of standing, as far as even before they where far left behind in the table but they show up their strongest and capacity by getting the 2nd position easily; so in this case even this first position they can’t find it difficult to get with their currently strongest.
Bayern Munich are currently 8 points better than Bayer Leverkusen with both teams playing 22 league games already so it means that they'll both play another 12 league games before the end of the season so mathematically, Bayern Munich are very far from being safe. Just two defeats for the Bavarians while Bayer Leverkusen wins their games will see both teams separated with two points so I believe Vincent Kompany and his players are very much aware that there's still more to play for if they really want to end the season as German champions.
That said, I think Bayern Munich will not want to throw away their lead and allow Xabi Alonso's Leverkusen overtake them. Bayer Leverkusen I believe will take the battle for who wins the German Bundesliga title this season down to the wire but I expect Vincent Kompany's men to lift the trophy