Transfer 320kbps .mp3 into .wav?

I have already added a lot of tracks to my library and I saw that they were 320kbps+ mp3, I thought that this was enough for the long run. Do you think I should change these 320kbps tracks to flac and then transfer them to wav.Because when I downloaded songs from trusted sources, it was possible to download .flac as well, but looking at older posts they say that 320kbps is ok. Now, is there a hearing difference in the club if it's .flac or wav??