Hmmm.... I might be wrong, but it looks to me like this plant has grown a self terminating floral cluster at the top -- kind of like a determinate plant side shoot. NORMALLY this doesn't happen -- even determinate plants have a non-terminating growth at the top.
But I HAVE heard of tomato plants doing this. I think I saw at least three or four reports last year just from casual and random web surfing.
What variety is this plant? Is it your only plant?
If it's an indeterminate variety, it's possible the plant will either grow a growth shoot beyond the floral cluster or grow a new side shoot from (probably) a nearest leafnode and keep going. In any case. I suspect the plant will start growing suckers/ side shoots (unless you've pinched/removed them all).
If indeterminate variety, it may continue to grow upwards from the side shoots, if determinate, all the side shoots could terminate in floral clusters (and fruits) and the plant won't grow any more.
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