If you are keeping up with the current material they are already acting like a couple. In the sense Yuuri is not denying he is Wolf's fiance and there is small stuff here n there. But if you are looking for if they were declared as a canon couple it's a 'no' because they want to cater other pairing as well.
By the way author has a clear bias towards Yuuri and Wolfram pairing.
Hays here we go again hahaha if you count where yuuri born which earth where the time is progressing slow while on the other world where wolfram born the time was fastest if you Compare it in the earth and count on one minute earth and weeks or months had passed in the other world so there's no different in their age bruh and wolfram body is exactly the same as yuuri and they always say he's childish but in light model he really matured and anyway back to the topic cam you see what I meant? Just compare conrad and wolfram age where conrad had lived in earth and experienced and he's adult by then and he literally the one who visits yuuri when he's young and that his Godfather bruh and in the light novel he often refer him 'he's like my old man' and he can see the way his father to conrad how can you do this bro while I'm reading in the novel and saw that line's it hit me so hard that he's js see him as conrad and nothing more than that it's uncomfortable to see this ship while literally yuuri said that

Will Yuuru gonna end up with Wolfram in the end???