As soon as we possibly can
2) Will there be ability to use the engine as library? Would love to use something like this through Python bindings.
That is in place already! It is an MVP, so I haven't published all packages for all architectures but you can compile it from source:
https://github.com/ironcalc/IronCalc/tree/main/bindings/pyth...
https://pypi.org/project/ironcalc/