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I am afraid I have not seen any information on this, and would like to see the answer to your question.
The main problem with the model 3 ramp seemed to relate to producing the battery/drivetrain. If, as stated, the same platform is used for the Y then hopefully about a year can be taken out of the production ramp. 75% part commonality should hopefully also reduce the amount of new engineering for the RHD version of the Y. As a result I would hope/guess it will not take the 2 years from production start to RHD versions being produced that we are seeing for the model 3. However this is all surmise - an estimate from Tesla would be nice
Sadly the Y is looking out for me as I have to take delivery sept 2020 and no sign of UK Y till 2021 from what I've read.. Will have to be Polestar or maybe XC40 depending on availability
As they are starting production 3-6 months earlier than the original announced date then you are probably in with a good chance. Like @Haf autumn 2020 would be optimum for me but that seems too optimistic. Let's hope we have a positive surprise