The Church is primarily, people united to her. Those people at the time of Christ are known as His disciples. So, the Holy Ghost speaks to the Church and He speaks to the people. That is in addition to the scripture.
There is no time limit in John 14 through John 16 (well, there is a time limit after when the Holy Ghost will speak, but there is not time limit when He will stop to speak). So, so long as there is the Church (Mt. 16:18 suggests, that would be a long time), the Holy Ghost speaks to her, and she speaks to us.
Define “Church”.
If it is the body of believers, and only believers, then you are correct.
However, if you mean the visible Church - well, it has believers and deceivers, and the deceivers do NOT have the Holy Spirit guiding them.
The promise of the Holy Spirit is to believers, not to ecclesiastical bodies. Jesus promised the latter would have wolves in sheeps’ clothing.