Modern scriptures indicate that having a body is necessary for a fullness of joy (DC 93:33). It is assumed by some Latter-day Saints—but not known by revelation—that it will be necessary for the Holy Spirit to receive a body at some point, but the timeframe in which He does so is not particularly important. (To travel overseas to another country, one needs both a passport and an airplane ticket. It doesn't matter in which order one gets the passport or the ticket, but one must eventually have both in order to reach one's destination.)