שְׁמַ֣ע יִשְׂרָאֵ֗ל אַתָּ֨ה עֹבֵ֤ר הַיּוֹם֙ אֶת־הַיַּרְדֵּ֔ן לָבֹא֙ לָרֶ֣שֶׁת גּוֹיִ֔ם גְּדֹלִ֥ים וַעֲצֻמִ֖ים מִמֶּ֑ךָּ עָרִ֛ים גְּדֹלֹ֥ת וּבְצֻרֹ֖ת בַּשָּׁמָֽיִם׃
Ecoute, ô Israël: tu franchis maintenant le Jourdain, pour aller déposséder des nations plus grandes et plus puissantes que toi aux villes importantes, dont les remparts touchent le ciel;
Rashi
גדלים ועצמים ממך [NATIONS] GREATER AND MIGHTIER THAN THYSELF — Ye are mighty but they are still mightier than you (cf. Rashi on Deuteronomy 11:24).
Chizkuni
אתה עובר היום, “you are crossing this day;” this is not to be understood literally, but means: “in the immediate future.”An alternate interpretation of these words: “you are being considered as if crossing the Jordan already on this day.”
Ibn Ezra
you cross today I.e., during this season (or perhaps the sense of the verse is, “Think of yourself as if you were crossing today”).