I’m trying to display the name of the current tag, i.e. the one we are in. Does not work. How to write correctly to display a tag in a template?

        #Models

        from django.db import models
        from taggit.managers import TaggableManager


        class Blog(models.Model):
            title = models.CharField(max_length=150)
            created_at = models.DateTimeField(auto_now_add=True)
            description = models.CharField(max_length=550)
            tags = TaggableManager()
    
            def __str__(self):
                return self.title


        #Views

        from django.shortcuts import render
        from django.views.generic import ListView
        from .models import *
        from taggit.models import Tag


        class TagMixin(object):
              def get_context_data(self, **kwargs):
                  context = super(TagMixin, self).get_context_data(**kwargs)
                  context['tags'] = Tag.objects.all()
                  return context

        class PostIndexView(TagMixin,ListView):
            model = Blog
            template_name = 'blog.html'
            queryset=Blog.objects.all()
            context_object_name = 'posts'

        class TagIndexView(TagMixin,ListView):
            model = Blog
            template_name = 'blog.html'
            context_object_name = 'posts'

            def get_queryset(self):
                return Blog.objects.filter(tags__slug=self.kwargs.get('tag_slug'))


        #Templates

        {% if tag %}
             <h3>Posts by tag: {{ tag }}</h3>  <!-- Does not display tag name -->
        {% endif %}

        

P.s. The site asks for more description, but what else can be described here? The problem with the output is described