parallel.sh

#!/bin/bash

# Start the timer
start_time=$(date +%s)

# Vars
import_images=12

# 1. IMPORT MEDIA

# Directory path where the images are located
DIR="Path to images"

# Loop through the range of images
for i in $(seq 1 $import_images); do
	{
		# Construct the image path
		IMG_PATH="$DIR\\$i.jpg"
		
		# Import the image using wp media import
		ATTACHMENT_ID="$(wp media import "$IMG_PATH" --porcelain --quiet)"

		# Create a post
		POST_ID=$(wp post create --post_title="Post Title for $ATTACHMENT_ID" --post_status=publish --post_type=post --porcelain --quiet)
		wp post meta set $POST_ID _thumbnail_id $ATTACHMENT_ID --quiet

		# Create a page
		PAGE_ID=$(wp post create --post_title="Page Title for $ATTACHMENT_ID" --post_status=publish --post_type=page --porcelain --quiet)
		wp post meta set $PAGE_ID _thumbnail_id $ATTACHMENT_ID --quiet

		# Create a WooCommerce product
		PRODUCT_ID=$(wp post create --post_title="Product Title for $ATTACHMENT_ID" --post_status=publish --post_type=product --porcelain --quiet)
		wp post meta set $PRODUCT_ID _thumbnail_id $ATTACHMENT_ID --quiet

		echo "($i/$import_images) Successfully imported image $i.jpg and set attachment ID to $ATTACHMENT_ID. Create post, page, and product with featured image."
	} &
done

wait

# End the timer
end_time=$(date +%s)
elapsed_time=$((end_time - start_time))

# Calculate minutes and seconds
minutes=$((elapsed_time / 60))
seconds=$((elapsed_time % 60))

# Display completion message with formatted time
echo "Completed in ${minutes}m ${seconds}s"

Sure. I just shared how to do this here in a Gutenberg 'block friendly' way.

https://twitter.com/dgwyer/status/1691125746067034116