Is Israel still blinded as a nation, and can an individual Jew still be saved?
Yes. Israel remains nationally blinded, as Paul repeats from Isaiah in Romans chapter 11, but that blindness is national, not individual. A Jewish person can still be saved and enter an individual relationship with God even while the nation remains under that national blindness.
Les teaches that God made a national covenant with Israel, and that covenant involved the whole nation. Yet a nation is made up of individuals, so God deals with the Jew individually. When Scripture says the nation of Israel shall be blinded, that is a national matter: nationally they have been blinded and are still blind. But an individual Jew can still be saved and come into an individual relationship with God even though the nation has been blinded. Les ties this to Israel's calling as God's peculiar treasure, a treasure of intrinsic value beyond comprehension, chosen above all people because God is sovereign and all the earth is His.
Are all Jews saved, or only a remnant?
Only a remnant of Jews is being saved today, not all. God has not cast aside Israel, but they are set aside in unbelief while He turns to the Gentiles. A few Jews are saved, yet it is just a remnant, as God has always kept His remnant. God will yet finish His dealing with Israel and fulfill covenant promises.
What is Israel's current spiritual condition?
Israel's current spiritual condition is unbelief. The nation is set aside while God works among the Gentiles, and it remains secular, under Satan's rule like other governments, yet God has not cast His covenant people aside. Only a remnant of Jews is being saved during this period.