Finn would go on the shelf with his injury and at this point there is still no indication as to when Finn will be making his long awaited return to the company. Recently as they always do and actually last year with John Cena as well a lot of sites were reporting that Finn could be a surprise in the Royal Rumble this year and I am here to tell you that this will likely not happen because the recovery time just doesn't fit. With that being said if he will not be back for the Rumble then I highly doubt he will be around for Wrestlemania because by the Rumble most of the plans are set place for Wrestlemania.
So when do I think Finn could be making his return to the company well this dependends on if they prefer him wait to being fully healthy or not, because if not I think there would be no reason Finn couldn't be in a the Rumble match. But the more likely is that they do care with that being the case I think Finn will return in the first few shows following Mania much like Cesaro did last year after his shoulder injury. But hte only way we will know for sure is by waiting for said thing to happen and for that you must believe anything can happen, but I do hope for Finn's sake that he does indeed wait until he is 100% to return and not in anyway bfore that time.