I don't believe so. I think, like with Deadpool, they saved money by not doing a 3D conversion so they could be a little more comfortable with the R-rating.
I just scanned through the Logan thread and still see no mention of 3D. We are seeing the movie regardless, but want to plan where and when. I do not see flat versions of 3D movies. For instance I did my research for the lego Batman movie and passed up the IMAX showing for real3D down the hall in the same complex.