"packing the court" specifically refers to adding more justices because you don't like the current ones. the last time that the court's number of judges changed was in 1869, when it went up from eight to nine.
So, I think it's fairly safe to say, no, the republicans have not yet packed the court. McConnell, however, has definitely played some hypocritical bullshit during Obama's term, blocking nominations from being confirmed specifically to allow a republican nomination, and that probably needs to be fixed as well as adding more direct oversight and ethics rules. (and I mean rules- not "guidelines")