If you intend to turn right in this situation, should you continue further on the lane you are occupying and change it immediately before the junction?

Why?

The arrow in your lane indicates straight-ahead travel, and the sign on the right shows a separate right-turn lane. You should move into that lane in good time, signalling and giving way to vehicles already using it. Leaving the lane change until you reach the junction may prevent you from turning safely.

art. 22 ust. 2 pkt 1, ust. 4 i 5 Prawa o ruchu drogowym