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use Drupal\Core\Entity\EntityInterface;
use Drupal\workflows\WorkflowInterface;

// Load the entity (e.g., a node).
$entity = \Drupal::entityTypeManager()->getStorage('node')->load($nid);

// Get the workflow associated with the entity.
$workflow_manager = \Drupal::service('workflows.manager');
$workflow = $workflow_manager->getWorkflowForEntity($entity);

if ($workflow instanceof WorkflowInterface) {
  // Get the current state of the entity.
  $current_state = $workflow->getState($entity);

  if ($current_state) {
    // Get possible transitions from the current state.
    $possible_transitions = $current_state->getTransitions();
    
    // Loop through possible transitions and gather information.
    foreach ($possible_transitions as $transition) {
      $transition_id = $transition->getId();
      $transition_label = $transition->getLabel();
      
      // Do something with the transition ID and label.
    }
  }
}