Bayern performance is extraordinary this season and I don't think that they are scared of any club be it Leverkusen or not. Leverkusen that has struggled to pick form and Bayern has been in form since the beginning of the season. It's only if Bayern drop form and start losing their matches before Leverkusen can take over the first position from them.
"Extraordinary" is a bit of a strong word, but yeah, Bayern is very solid this season. Their average points per game in the Bundesliga is 2.40. For comparison, it was 2.12 last season and 2.09 in 2022-23 when they defended their title with only 71 points.
Their Champions League performance is a bit less impressive, as so far, they have failed to get to the top 8 and be guaranteed to advance to the next round without having to go through play-offs. I expect them to get there though, as the only two games left in the League stage are against Feyenoord (away) and Slovan Bratislava (home) so they should easily earn at least 4 points, but possibly even 6, in which case, they'd almost definitely end up in the top 8.