Sforno on Genesis 2:5/ספורנו על בראשית ב׳:ה׳

1טרם יהיה בארץ, these words emphasise that although all phenomena had been created, this referred to their potential, not to their functioning as they do nowadays. כל עשב השדה, had not yet sprouted,

2כי לא המטיר, for G’d had not yet made it rain in such a fashion that it enabled the latent power of these plants to fully develop.