die Schlussphase
final phase
The last section or final phase of an event, process, or development.
In der Schlussphase des Spiels schoss die Mannschaft noch zwei Tore.
In the final phase of the game, the team scored two more goals.

final phase
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final phase
The last section or final phase of an event, process, or development.
In der Schlussphase des Spiels schoss die Mannschaft noch zwei Tore.
In the final phase of the game, the team scored two more goals.

This word is a simple compound made up of 'der Schluss' (the end) and 'die Phase' (the phase/section). So it literally means the 'end phase'.
Das Projekt geht jetzt in die Schlussphase.
The project is now entering the final phase.
The word is usually used with the preposition 'in'. It is often followed by a genitive or a 'von' construction to specify what is coming to an end.
In der Schlussphase des Rennens überholte er den Führenden.
In the final phase of the race, he overtook the leader.
'Schlussphase' (final phase) is very often used in the context of sports (games, races), politics (election campaigns), or projects to describe the last, often decisive moments.
In der Schlussphase des Wahlkampfs versuchen die Parteien, unentschlossene Wähler zu überzeugen.
In the final phase of the election campaign, the parties try to convince undecided voters.
finale / final
'Das Finale' and 'die Schlussphase' both refer to the end of something. 'Das Finale' is a specific final and important part, for example the final match of a tournament or the last part of a performance. 'Die Schlussphase' is more general and means the final section of an event or process. It does not have to be a single game or a special climax itself. The words can be confused because both are at the end. As a guide: 'Finale' suggests a clear final event, while 'Schlussphase' suggests a period of time shortly before the end.

In der Schlussphase des Projekts mussten wir besonders genau arbeiten.
In the final phase of the project, we had to work especially carefully.
Das Finale des Wettbewerbs war spannender als alle Runden davor.
The final of the competition was more exciting than all the rounds before it.