Can you delete a song while it's converting into an AAC file on iTunes?

So i don't have a mac and i just hopped on using an iPhone along with iTunes and i have hundreds of songs that are mp3 that need to be converted so grouped them all up (holding Ctrl) right clicked and clicked convert. Now heres the problem i'm tempted to delete all the MP3 versions of songs while they're all highlighted but they're still converting. So should I wait till its done converting or can I delete them now while its converting?

If you delete them before the process is finished, it's not going to convert because the file will be gone.

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