Hello, @user1537879633457 It is sure that Nokia is going to update Nokia 8 Sirocco to Android Pie after the stable release of Android Pie on Nokia 7 Plus. So, I think we can expect for the beta labs to arrive in October. For the stable release the time can vary.
Nokia 6.1 Plus will get Android Pie soon as per the claim by company while launching the phone in Indian Market. https://www.pricekart.com/blog/nokia-6-1-plus-india-sale
Just found out that Nokia 6.1 and Nokia 6.1 Plus will be receiving Android Pie updates much earlier in October than the Nokia 8 and Nokia 8 Sirocco which will be receiving Android Pie updates in November from a recent Nokia event in London.