[Jaseur]

Well, there are 1945 jouyou kanji so you're about a tenth of the way through.

Once you have a fair amount of vocabulary and can recognise around 1000 or so kanji you will be able to make some sense of Japanese writing.

300 kanji should take you to about Japanese Language Proficiency Test level 3. You won't be able to read very much with that though.

Oh, and don't forget that being able to recognise kanji is significantly easier than being able to write kanji.