A standup, or daily scrum as it's called in scrum, is a simple daily coordination for the team. Nothing more nothing less. It's there for the team to gauge the progress towards the sprint goal and in some cases give a status update on team relevant stuff. You can use it to evaluate prioritization, perhaps a team member is sick, perhaps some task took longer than anticipated. How do we need to adjust to still meet the goal, or are we unable to and should notify the relevant people.