Pleased with their endeavour;
Satisfied with their work
well pleased with their striving
Glad for their striving
Accepting/approving for its striving/endeavor
These are those who are happy with their accomplishment
Rejoicing over their efforts
Well-pleased with their past striving
Delighted and rejoicing over their (righteous) travail
Well-satisfied with (the fruit of) their (pious) strivings
Glad with their endeavour (for their good deeds which they did in this world, along with the true Faith of Islamic Monotheism)