YOU SAID:

we are planning to finally do this

INTO JAPANESE

最後にこれを行う予定です。

BACK INTO ENGLISH

I intend to do this at the end.

INTO JAPANESE

私は最後にこれを行うつもりです。

BACK INTO ENGLISH

I'm doing this at the end.

INTO JAPANESE

最後にこれをやっています。

BACK INTO ENGLISH

Finally doing this.

INTO JAPANESE

最後にこれを行います。

BACK INTO ENGLISH

This will last.

INTO JAPANESE

これは最後になります。

BACK INTO ENGLISH

This is the last.

INTO JAPANESE

これが最後です。

BACK INTO ENGLISH

This is the last.