It is very unlikely that Leverkusen will lose points when facing Bochum, especially since the opponent they are facing is a team that is at the bottom of the table and this match is played at home as you said. In addition, Leverkusen has not given up on continuing to defend the Bundesliga title even though it is difficult, but Xabi Alonso is not the type to give up easily before the season ends.
Because even though they are currently 6 points behind Bayern Munich but with 8 matches left anything can happen, in football there are always unexpected surprises. Moreover, Bayern Munich has a concentration on the UCL league while Leverkusen does not. Of course this indirectly has a big impact on the Munich squad, especially if Kompany does not maintain the fitness of the players by rotating the players, the potential for losing points is very large.
Leverkusen can actually mount more pressure on Bayern Munich if they win on Friday against Bochum there by reducing the points difference to 3 points untill after Bayern Munich game on Saturday. Bochum might actually not be an easy meat to chew because they actually surprised Bayern Munich just few weeks ago by defeating the 3 - 2, infact in the first leg, Leverkusen were not able to defeat them as they played a 1 - 1 draw in the first leg. Leverkusen needs to put up a better performance and kill off the game before Bochum could realise themselves.