Reports are it is now showing spectral features of a 1c-BL supernova. There is an HCT spectrum (rectified to remove the blue continuum) linked from David Bishop’s page
http://www.rochesterastronomy.org/sn2018/sn2018cow.html
but the features are not as obvious yet compared with this one for example I called as a 1c-BL last year
https://wis-tns.weizmann.ac.il/object/2017ixv
Robin