Yes- you can schedule your Teams Meeting in Blackboard well in advance.
Please keep in mind- the Students will not be able to see the Teams Meeting link in Blackboard until approximately 1 hour before the meetings scheduled time. This is Because of the “Adaptive Release Policies” that exist in Blackboard. Here is a link from Blackboard that explains more about the different Adaptive Release Options in Blackboard. (https://help.blackboard.com/Learn/Administrator/Hosting/Tools_Management/Adaptive_Release )
If you are creating multiple MS Teams Meeting links at the same time in Blackboard- you could run into an issue with the Meeting Links not being added to your Blackboard Course. (After you click on “Add To Calendar”) There is a known bug where Blackboard and Microsoft sometimes have a delay in communicating with each other. If you are trying to create multiple MS Teams Meeting links at the same time in Blackboard- you may have to wait 15 -20 minutes in between creating each one.