Brood box filling up with honey.

[Finman]

Finman: wet as in, this year's spun out OSR frames i.e. one supers worth.

OK, extracted this year.

It depends how strong is your colony. Can it keep warm the brood.
You may leave the excluder off, and let the bees fill Super with brood. Look what happens then in July. Perhaps you have then a strong colony.