What exactly has he done?

Very little. He hasn't shown up in the COVID19 daily briefing for 4~5 months at least. Granted he's been focusing completely on his failed re-election campaign. But still, it's just outrageous for a president to ignore the nation's #1 health crisis. Before Trump can claim any credit for any progressw, he must first own up to the situation that has led to the 200K+ daily infection and 1000+ daily death!