Tosafos in R"H 33a proves from this gemara that acc. to R' Yossi that Semicha for women is a "reshus", we see that there is a kiyum mitzvah for woman to perform time bound positive mitzvos. The difficulty is that R' Yossi himself is really just coming to say that it is "mutar" to the exclusion of the tana kama who says assur, but we don't find that R' Yossi holds that there is an actual kiyum mitzvah. Furthermore, he seems to say that it is only for the sake of "nachas ruach l'nashim", which indicates that there is not necessarily even a kiyum mitzvah, rather it is purely a d'var hareshus?
It seems to me that the proof is actually from the shakla v'taria of the gemara. The gemara originally wants to prove that semicha does not have to be done with all your strength, bec. if it would have to be done b'chol kocho, then we could not allow women to do it and violate avodah b'kodshim. The gemara is then madcheh that perhaps it does have to be done b'chol kocho, and we would instruct women to do it in a way where they are not really doing semicha at all. It seems from the dichuy that according to the approach that semicha does not need kol kocho, women would actually be accomplishing something with their semicha and they would at least be performing a mitzvah. This seems to be the proof of Tosafos that there is a kiyum mitzvah to which tosafos adds (there and here) that they can even make a beracha on it.