Grow bag split

One of my grow bags that I bought for my toms has split.  I usually grow with the ring culture method.
I am going to grow them in pots now using the soil from the bags.  What size of pots will I need?
They are still in the small pots but have a few trusses starting on them. Is it time to put them into their final growing place. They will be in my greenhouse.

we get our 10 inch pots from ASDA, we get the empty flower display tubs they will give you them ,

Thanks for your answers. Am I ok to do this now or do I need to wait until the trusses are larger. They are just showing now.