How can I check if the cart has shippable products? How can I check if the cart has any shippable product in Ubercart 3 for Drupal 8? Previous version had uc_cart_is_shippable() method which Drupal 8 module does not seem to have by default.

Is there a separate/additional module to get this function working? Or how else can I check if the cart has a shippable product?
The function is now a part of the CartInterface and implemented in the Cart::isShippable() method. You can use the CartManager service to retrieve the Cart object and call the method:

\Drupal::service('uc_cart.manager')-&gt;get()-&gt;isShippable()