My late mother and I would always guard the Tomb after Good Friday Vespers.
Backtrack: During Lent we’d have a sign-up sheet to guard the Tomb.
On Holy Thursday evening after Passion Matins with the 12 Gospels, some parishioners would stay behind and set up the Tomb of Our Lord with the Plashchenitsya (an icon of Our Lord Who is taken down from the cross with Our Lady, St. John, St. Nicodemus, St. Mary Magdalene, and the holy women).
On Good Friday, everyone would go to Vespers and then come back for their hour (a few people would sign up for 2 hours) to “guard the Tomb”. When your hour came, you’d kneel down at the back of the nave, and on your knees go up to the Tomb, make a prostration, kiss the Holy Gospel book, the Holy Wounds of Our Lord, and then the Holy Cross, go back on your knees, make another prostration and then go to your pew to "guard the Tomb. No talking in church, only prayer.
Mom always wanted the hour after Vespers so that’s what we’d do. One year we had to take the hour after that so we stayed after Vespers for about 2-3 hours. I’d always bring my rosary and good books for Mom so she could have something to read. We’d know our hour was up when the next person(s) would come up on their knees and venerate the Plashchenitsya. After they went to their pew, we’d go up on our knees, make another prostration, venerate the Gospel, the Holy Wounds, and the Holy Cross again and then leave in silence.
This is my first Holy Week without Mom, and AFAIK this will be the first Good Friday without the Tomb in church. (We got an email saying that there will be no Tomb in the church because you need parishioners to put it together and that’s not possible this year because of social distancing).