to prevent too early fruit so they will stop grow

That's not how tomatoes work.

You either have determinate tomatoes, that will stop (regardless of anything you do, so removing flowers will just reduce yeild) when they are ready to ripen off a bunch of fruit and die.

Or you have indeterminate tomatoes, that will grow and set fruit until something else (frost or blight, typically) stops them. In areas without frost they can grow and fruit for years if blight (or a hurricane) doesn't get them. Removing first flowers will both reduce and delay your yield.

There are also differences in pruning recommendations based on whether the variety is determinate or indeterminate, but you haven't told us a variety.

to prevent too early fruit so they will stop grow

That's not how tomatoes work.

You either have determinate tomatoes, that will stop (regardless of anything you do, so removing flowers will just reduce yeild) when they are ready to ripen off a bunch of fruit and die.

Or you have indeterminate tomatoes, that will grow and set fruit until something else (frost or blight, typically) stops them. In areas without frost they can grow and fruit for years if blight (or a hurricane) doesn't get them. Removing first flowers will both reduce and delay your yield.

Since your Ondraszek tomato is determinate you don't really want to prune much of anything. Good luck! The main issue with direct planting in cool climates is beating the frost on the time to harvest.