Is Israel still blind to what Paul experienced, and will their blindness end?
Yes. The nation of Israel remains blind to the revelations Paul received, but their blindness is not permanent. The context says, "Their day is coming," showing that Israel's blindness will end. The timing is not specified in the supplied context.
Les explains that Paul received these revelations by inspiration and revelation, and Paul described himself as one born before the due time—not an abort, but early. The whole nation of Israel is still blind to these great things Paul experienced, yet their day is coming. The rest of Israel was blinded, but believers need not be blind. The context then moves to Romans 3, where the law could only condemn and say guilty, while God's righteousness is appropriated by faith upon all who believe, with no difference between Jew and Gentile. The Jew must come on the same level ground, not on covenant ground.