Greetings, young Albert!
I have a plum tree and a cooking apple tree ready for planting from the large pots they are in. It won't be done today, as it's a wet and windy one.
I also have two smaller apple trees in pots, one cooker (different variety) and one eater. I am not intending planting those two in the ground until at least the coming autumn/winter, as they were only grafted onto their rootstocks last year.
All the apple trees are on MM106 rootstocks, which is a semi-dwarfing stock and will grow up to 3 to 4 metres high (10 to 15 feet). I didn't want to buy ones on dwarfing rootstocks (M26), as they don't produce a very vigorous root system, and would likely suffer from wind damage in my climate.
The plum tree is on a St. Julien A rootstock, which grows to around 3.5 to 4 meters in height (11 to 15 feet).