The thing with the JWST design, and big mirrors in general, is that they are built with the possibility of damage like that in mind. In 1970 a man unloaded 7 9mm shots point blank into the 2.7 meter MacDonald Observatory telescope mirror. The 7 holes barely reduced its efficiency by 1%.

By comparison, the JWST is 6.5 meters and the meteorite that hit is reported to be about the size of a grain of dust, so the damage has even less of an impact. More importantly than that, the JWST was designed to compensate for something like this, and it is still performing well above initial hopes.

Basically, while it was noticeable and is a good reminder that we can't get up there to do repairs, at least at this point there has been no damage that reduces its efficiency.