Eureca !
I finally had my Pi coins transferred on the mainnet chain :-)
612 Pi's, to be precise.
I had to follow all the steps mentioned in "Mainnet Checklist"; if you'll also get out of patience like me, be sure the last step will indeed get completed, one day or the other! As far as I understood, they are pseudo-manually reviewing migration-to-mainnet applications before convalidating them. It took almost a month to me, in total.

So, what I'm writing for? Just to remind you that this is still a potentially explosing project and that they are not dead...
But, as they wrote on their latest blog, they need to achieve certain milestones in order to go fully mainnet on the Open Network:
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Condition 1: Finish any Open Network preparation work in technology, product, business and legal following the consistent strategies of Pi Network.
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Condition 2: Achieve the following goals in network KYC, migration and utility creation.
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KYC and Migration
- 15 million Pioneers have passed KYC including fully and tentatively KYC’ed; and
- 10 million Pioneers have migrated to the Mainnet.
Utility
- 100 real Pi apps that (1) are on the Mainnet or are Mainnet-ready, (2) comply with the Pi platform policies, (3) solve a true need and bring utility to the Pi ecosystem, and (4) are a distinct application (i.e., not simply an unmodified clone of the demo app or another Pi app).
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Condition 3: The absence of an unfavorable external environment which would hinder the success of Open Network.
So please, all of us must engage in KYC and mainnet migration in order for the PiNetwork to go live :-)
Can't wait to know the price Pi tokes will be exchanged at after official listing ! A price in the range 0.1$ <-> 1$ would be already good enough for me
Be Careful : existing listings of Pi Network are fake, i.e. they are not even authorized by the Pi Network core team.