Method for operating an agricultural working group, the working group comprising - an agricultural working machine and - an agricultural square baler, wherein the square baler is coupled to the working machine and connected to a power take-off of the working machine so that the square baler can be towed and driven by means of the working machine, comprising the following method steps: a) Material to be pressed is picked up from a ground and fed at least indirectly to a main channel of a main compactor. b) Within the main channel, the pre-compacted material is collected by means of the main compactor and pressed against material already present in the main channel, the main compactor being transferred in an oscillating manner between a maximum retrieval position retracted in the main channel and a maximum pressing position extended in the main channel, characterised by the following method steps: c) Starting from at least one operating time of the working group, at least one compression time lying in the future is determined at which the main compactor will be in its pressing position. d) An output power of the working machine is increased to a peak level such that the peak level is applied to the main compactor at the compression time. - an agricultural working machine and - an agricultural square baler, wherein the square baler is coupled to the working machine and connected to a power take-off of the working machine so that the square baler can be towed and driven by means of the working machine, comprising the following method steps: a) Material to be pressed is picked up from a ground and fed at least indirectly to a main channel of a main compactor. b) Within the main channel, the pre-compacted material is collected by means of the main compactor and pressed against material already present in the main channel, the main compactor being transferred in an oscillating manner between a maximum retrieval position retracted in the main channel and a maximum pressing position extended in the main channel, a) Material to be pressed is picked up from a ground and fed at least indirectly to a main channel of a main compactor. b) Within the main channel, the pre-compacted material is collected by means of the main compactor and pressed against material already present in the main channel, the main compactor being transferred in an oscillating manner between a maximum retrieval position retracted in the main channel and a maximum pressing position extended in the main channel, characterised by the following method steps: c) Starting from at least one operating time of the working group, at least one compression time lying in the future is determined at which the main compactor will be in its pressing position. d) An output power of the working machine is increased to a peak level such that the peak level is applied to the main compactor at the compression time. c) Starting from at least one operating time of the working group, at least one compression time lying in the future is determined at which the main compactor will be in its pressing position. d) An output power of the working machine is increased to a peak level such that the peak level is applied to the main compactor at the compression time.