In plain words
Knowing this, the yogin goes beyond whatever meritorious fruit is declared for the Vedas, yajñas, tapas, and gifts, and reaches the primal supreme state.
Word for word
Whatever fruit of merit is declared in the Vedas, in yajñas, in tapas and also in gifts, having known this, the yogin goes beyond all that, and reaches the supreme, primal state.
The commentators
Bhagavadgītābhāṣyam
शृणु तस्य योगस्य माहात्म्यम् —
वेदेषु सम्यगधीतेषु यज्ञेषु च साद्गुण्येन अनुष्ठितेषु तपःसु च सुतप्तेषु दानेषु च सम्यग्दत्तेषु, एतेषु यत् पुण्यफलं प्रदिष्टं शास्त्रेण, अत्येति अतीत्य गच्छति तत् सर्वं फलजातम् ; इदं विदित्वा सप्तप्रश्ननिर्णयद्वारेण उक्तम् अर्थं सम्यक् अवधार्य अनुष्ठाय योगी, परम् उत्कृष्टम् ऐश्वरं स्थानम् उपैति च प्रतिपद्यते आद्यम् आदौ भवम् , कारणं ब्रह्म इत्यर्थः ॥ २८ ॥
In plain words
Now hear how great that yoga is —
'In the Vedas' means the Vedas truly mastered, not just recited; 'and in sacrifices' means those carried out with every element properly in place; 'and in austerities' means those genuinely and fully undergone; 'and in gifts' means those given exactly as they should be given. Whatever reward scripture promises from all of this, the yogī goes clean beyond it, the entire pile of it — because he has understood this teaching, worked out through the resolving of Arjuna's seven questions, grasped it correctly, and actually lived it. And having done that, the yogī reaches the supreme, most exalted, divine station — the primordial one, the one that exists at the very beginning of everything, the cause itself: Brahman.
Close to the Sanskrit
Hear the greatness of that yoga —
'In the Vedas': in the Vedas properly studied; 'and in sacrifices' performed with all their proper components; 'and in austerities' well-practiced; 'and in gifts' properly given — whatever fruit of merit is declared by scripture in these — the yogī transcends, goes beyond, that entire mass of fruit; having known this — through the resolution of the seven questions, having correctly ascertained and put into practice the meaning thus stated — the yogī attains, reaches, the supreme, excellent, divine abode, the primordial one, that which exists at the very beginning, the cause, Brahman — this is the meaning.