The antonyms for the word "art in arrears" would be "current" or "up-to-date." When something is in arrears, it means that it is behind schedule or overdue, so the opposite would be that it is current or up-to-date. In the context of art, being in arrears might refer to outdated or not fashionable styles, techniques, or subject matter. To be current means to be in line with contemporary trends and tastes. It is important for artists to keep their work up-to-date and relevant to the times, otherwise, they risk being left behind or overlooked.