Okay, I did the top 11 since we don't know where Ortiz will end up. If Ortiz has an OPS+ of 110 the rest of the way, he would end up with 132, still in the top 10. If he can do 140 the rest of the way (140 was his OPS+ in each of the last two seasons) he would finish at 153, which would still be the 2nd best ever. If he does 148 the rest of the way, he finishes with 159 and that would still beat Mays.
If I use 300+ PAs as a qualifier, here are the leaders. Only Ted Williams is higher than what Ortiz has right now.