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What wattage should I expect from SSE? (AKA, pairing SSE with Bozaks)

Hello all!
I'm building a tubelab SSE amp. You may have seen my seemingly countless other forum posts about this recently... I've had a lot of questions, because I'm a bit of a noob!
It took awhile to pick an output transformer, but I finally settled on the TTG-EL34SE, since I have EL34 tubes to use with this build.
I'm wondering, given those tubes and those transformers, is there a way to estimate what kind of wattage I should expect?

I ask because I think I've found a pair of speakers I'll be using with this amp. They're the Bozak B401 Rhapsody. Turns out I've had them in my basement this whole time, and I think they'd be perfect with a tube system. They're 8 ohms input (the transformers I chose have an 8 ohm tap, so that's good) and what documentation I can find on them seems to indicate they require 15 watts minimum.
So I'm curious if the SSE could be a decent match for those speakers.

I've read that the amp might be able to get close to that wattage in UL mode. The transformer does have a UL tap. Anything I should know about configuring the SSE for using UL mode?