Hmm.. I can't think of a context in which that phrase makes sense. I can only think of a situation in which you (or someone else) are explaining the contents of a spanish course, and in the middle of the explanation you say "By now, you will be..." or "At this point, you will be..." In that context you could say "A esta altura, estará(n) sorprendido(s) de lo impresionante/espectacular/genial que es el español". "A esta altura" would be the translation of "At this point" If you prefer to stick with your examples, I'd say: En este momento, estará sorprendida de lo impresionante que es el español. One thing is clear: "Por ahora" doesn't belong there.

Por ahora, Estarás sorprendida de lo asombroso que es el español. in that case u dont need to use "como"

The correct form is: Por ahora estarás sorprendida de lo asombroso que es el español :)