May invited Bo to attend a Christmas party. Bo's mum replied as follow:
I need to comfirm with Bo first. As far as I know, Bo's been fully booked before and after Christmas at the moment.
Can I replace at the moment by so far? Any other suggestion?
NOT A TEACHER!
If you use so far, it seems okay to me, but it sounds repetitive because you have already used "as far as I know"
Therefore, I would stick with "at the moment." If you try to be fancy, you can use "until further notice."