The official Twitter account for Food Wars! Shokugeki no Soma announced on May 12 when the 5th season, The Fifth Plate, would return to Japanese TV screens.
While the English announcement above says the season is postponed till July 2020, the Japanese announcement says it’ll be broadcast in or after July 2020.
The official website confirms that in Japan, the 4th season, The Fourth Plate, would continue its rebroadcast on Tokyo MX and BS11 for the time being.