When can we speedrun on the emulator pc ?

You can always speedrun on emulator. Who is stopping you?

Currently, the emulator is only playable with a mod, and it's being updated very frequently. Discussions between leaderboard moderators has already started about how we will address the emulator in the future. In the meantime, with all the performance mods available to you, you can run the game on emulator if you wish, but no runs will be accepted to the leaderboards as of now.