Yes and no.There's no financial reason to extend Sale until Hanley and Sandoval are off the books, and since Porcello and Sale himself will also be coming off then, the FO has 75 million reasons to wait to reassess until then.
Extending Mookie and Xander needs to remain priorities 1 and 2.
If Sale pitches the rest of the year as he has started it out, and especially if he carries it deep into the post season, then he can ask a lot more money at that time than he can now.
Weighing up the possibility of that (and how much more he could command) versus the luxury tax implications of doing it this year is the tough part.