Samsung is now sending a new software update to the Galaxy Note 9 and Galaxy Note 10 series. It brings the December 2019 security patch.
Samsung Galaxy Note 10+, 10, and Note 9 software versions are N975FXXS1ASKB, N970FXXS1ASKB, N960FXXS4CSK2 repectively.
You can check for the update manually by heading into the Settings > Software update.