While we upgrade blackstone building we cant collect finished blackstones. Im upgrading lvl 10 now and need to wait 2 days for collect blackstones.

thers actually a trick you can use... when you have max stones from normal game (not camp) check notifications and click on "you have black stones to redeem" from there. you will be telephorted directly inside that window where you can redeem your stone ;)

Yes you can. You have to be outside of camp and click on the notification of collect black stones, and it will open up to click "collect"