I'd say that it's ready, mix sounds balanced on my system listening at a comfortable level. However, your peak is under -9dB and RMS averages -17dB. I did an overall gain increase, IOW, no compression, just turned up the gain to -.3dB, your RMS is now at -7dB. Obviously you weren't compressing to achieve perceived leveling, otherwise peak gain wouldn't be down to -9dB. IMHO, if you would have left a little more footroom, not headroom (peak), but lower RMS, the ME would have a better file to work with. The tune could be mastered as is, but leaving a bit more RMS, say -12dB and the ME, in my case anyway, will be able to get more clarity when final perceived leveling is applied.