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235/60 r 18 Is the most commonly fitted size to XC90’s in this country: 255/55r19 were fitted to some of the higher spec models such as the executives etc, but there is no guarantee that 𝚈our Car is fitted with the wheels that were on it when it was new.
There is a long thread about XC90 tyres in the XC90 part of this forum, with almost as many different recommendations as there are answers, but I can only speak from experience.
I found that the originally fitted Pirelli’s were not very good and have been using Nokian WR2 winter tyres for several years now and have found them to be superb all rounders.
There are usually some good deals to be had on Nokians on the on line suppliers such as Black Circles or Tyreleader.