I have a sizeable turkey and a rubbish oven - it gets very moody if I put in more than one thing, and has a temperature control best described as artic or hellfire with very little in-between 🤔
I have an air fryer for when it's just us, but last time I did a sizeable Sunday roast, we ate several hours late.
Thinking ahead to Sunday, the oven will need to perform for the roast potatoes. There is no way it will cope with the turkey too. Can you see any problem with cooking the turkey the day before, popping in the fridge once cold and then slice and heat up the day after?