Looking at the literature, and please tell me if I am wrong, it seems that the yukawa couplings fail to unify.
This seems to counter the intuition that all the particles in a multiplet should have the same mass, but surely it can be argued that the mass of the multiplet is zero until the higgs mechanism is activated. (Still, comments are welcome about this; even yukawa "charge" could be expected to be unified in GUT, should it?).
At most, you can get some intersection between the yukawa of the charged lepton and the one of the down-type quark. Note that most work on GUT unification was done still in the age of empirically massless neutrinos, so no yukawa coupling for them, or in any case not enough experimental input to try to match them to the up-type quarks.
Sometimes a reverse approach is applied, assuming that some "texture" happens in the GUT scale and then running down the yukawa couplings it a way that the one of the top approaches to unity. I guess that one could also try with a texture where only the top has mass, and some custodial protects the other yukawas so they are zero in first order.