Account Migration has not begun. There will be an in game message when it's your turn to move. Do not fall for any third party websites that are telling you to migrate NOW. They're trying to steal your information.
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what happens if someone doesn't do it in time (which can be not their fault)
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Replying to @alkamaass
No worries if you want to wait a little to migrate your account when you get the notice that it’s your turn. We’ll let you know when time is running down. help.minecraft.net/hc/en-us/… ^SM

Oct 23, 2020 · 8:46 AM UTC

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Replying to @MojangSupport
I don't think it's fair for time to run down, people can be away for military, taking a break to disconnect from the internet, will Mojang promise to let anyone with a Mojang account not lose access to the minecraft that they paid for?