If they June bearing strawberrries they will produce runners soon. My day-neutral Tri-Stars either don't produce runners, or very few and haven't done so in a while. I forget which. So, if the are a June-bearing variety I would hold off on planting them. When they produce runners you can set the whole shebang in the garden and the runners will root. These varieties produce best when the oldest plants are culled every 3 years or so. (Day-neutrals produce best when left alone.)
I only say this because you might just do best to lose the berries if you want to plant them in the garden. If they are truly root bound you should prune those roots back heavily when replanting, and the plant might choose root growth over berries.
Me? I would either leave them be, harvest the berries and afterwards get the plant ready to go in the garden. Or I would remove the berries and flowers, rip back the roots and plant, hoping for an even better harvest next year.