Yes, they are OK.

Other
Are these sentences correct?
I have to attend to some personal appointments the following Thursday (March 11th) so I plan to take time off work that day. To make up for this time off, I will work this coming Saturday (March 6th).
Yes, they are OK.
“Every miserable fool who has nothing at all of which he can be proud, adopts as a last resource pride in the nation to which he belongs; he is ready and happy to defend all its faults and follies tooth and nail, thus reimbursing himself for his own inferiority.”
— Arthur Schopenhauer
the following Thursday- how about next Thursday?
Or "Thursday week".
This Thursday is March 3rd. Next Thursday/Thursday week is March 10th.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
Sorry- I didn't check the calendar.
We also use "a week [on] Thursday".
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
Here in Canada, I think most people use "this Thursday" when they mean the Thursday of this week, and "next Thursday" when they mean the Thursday of next week. But there are exceptions: sometimes people use "next Thursday" when according to the rule above they should say "this Thursday." So it is wise to be cautious and double-check.
Here's an example of it being used in the past: https://www.youtube.com/watch?v=FswDoZKFXVc
It sounded odd to me the first time I heard it, and still does.