Also check out my video on How Home Purchases are Made.
there will also be buyers on the other side that would need a tub for there children or themselves.
There is no way to put a value on it just that some buyers will appreciate the new shower and some will keep looking for a unit with a tub. Being in Hoboken I would say enjoy yourself and when you are ready to sell you will have to wait for the right buyer which may not be long in Hoboken anyway.
best wishes for the new year