What unlocked version you have? US unlocked or international version? I'm using the US unlocked version on Verizon and received the update few days back on 31st itself. The update for the US unlocked model was released on 31st and lots of people started receiving it. Did you go to settings and manually check for software update? Click it few times to see if it triggers the update.
I hope u get quick Sprint was historically the 1st to get Android updates I have att note 10 plus and we even got it 2 weeks ago ... All I can say it good luck and keep checking ..