Do the Jehovah's Witnesses believe the new covenant is for gentiles?

My understanding of the new covenant is that it was made ONLY with the houses of Israel, not with gentiles: >[Jer 31:31 KJV] 31 Behold, the days come, saith the LORD, that I will make a new covenant with the house of Israel, and with the house of Judah: > >[Heb 8:8 KJV] 8 For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah: It seems to me that they ascribe to the "anointed class" features of the "great army" of the new covenant Jews: >[Eze 37:10 KJV] 10 So I prophesied as he commanded me, and the breath came into them [IE: the regathered Israel in Jerusalem 33AD], and they lived, and stood up upon their feet, an exceeding great army. Do they believe that the new covenant is in force today among them (gentile JWs) in any way?