We're fatigued/exhausted, so we should definitely rest.

Lara told the Wyvern to wait two moons, so we're not out of time yet, but it never hurts to send an update if possible, she's not suggesting we return just yet.

Given the temperatures in the day we may wish to adventure in the dark/morning before things heat up. If we rest from now and begin immediately after we're rested without waiting for it to get light we can avoid the worst of the heat.