Sorry i havent got a clue!
Ive done this too-father in law died in November and there was just 1 of his homegrown tomatoes in his fridge.
Missus wouldnt let me eat it or throw it and it was in danger of rotting in my fridge at Christmas!
So managed to talk her into letting me ferment the pulp to get the seeds for growing this year.
The problem is i dont know if it was an F1 tomato or determinate/indeterminate-but i do know one thing, before this she had no interest in my veg growing, but now these tomato plants get looked after better than me and the kids-owt for a quiet life!
I usually stop my toms after 5 trusses and so will do the same if it produces any!