It’s really pretty hard to pin Baptists down regarding Good Friday or Maundy Thursday. I have encoutered some that are part of the SBC that have a simple prayer service for each of them, some even have a foot washing service on Maundy Thursday. Some don’t have any type of service but close their offices and their employees are off on Good Friday to simply observe the day.
Then of course there are the more fundamentalist types that believe that Jesus died on a Wednesday and think that Good Friday isn’t scriptural. As an earlier poster said, there are many types of Baptists and even those in the same convention are still all autonomous church bodies. I’ve grown up SBC and have never been a member of a Church that did observe Good Friday or Maundy Thursday except to allow the church employees the day off on that day, but that’s been only 2 SBC churches though. I have heard of others in the area that do have services though.