The marker could/should be aware of where the disc is going to come into play and can start stalling as soon as one foot hits the in play area, as that’s the established pivot.
In regards to making other players on the field aware, they can either look at when the thrower is standing in bounds or the thrower/marker can shout “Disc in” in make everyone else aware. I don’t think a ground check is required, and it always looks awkward as people try to rush it out as fast as possible.