As previously stated, viewers learn of Peacemaker's status in the second post-credits scene for The Suicide Squad. Of course, if you kept up with the DCEU schedule at the time, then you already knew there was no possibility of Peacemaker dying due to his spinoff series.
So, now let's discuss the series premiere of Peacemaker. Chapter 1, titled "A Whole New Whirled," takes place five months after the Corto Maltese mission. And rather than the bruised and battered individual we saw at the end of The Suicide Squad, it appears the titular anti-hero, whose real name is Christopher Smith, is recovering nicely from his life-threatening injuries.
According to his doctor, she is still as surprised as ever at how Peacemaker managed to survive a near-fatal gunshot wound and a collapsed building. Even after all the damage he endures, the only thing Peacemaker has to account for is a replaced clavicle.
As a result, the doctor tells him to take it easy, informing him to avoid pushing his right elbow higher than his shoulder; otherwise, it will cause more harm. But, in classic Peacemaker fashion, he goes against her wishes.