Delivery performance


I am working on a project which is based on an exploratory data analysis, where we have a lot of data sets coming from a e-commerce company.
I am interested in studying the delivery performance : I have created a table with the following columns : order_id, customer_state, product category_name_english, order_delivered_customer_date (without the hours dimension) and order_estimated_delivery_date. Then, I calculated the differences between the estimated delivery date and the actual delivery date to check whether it was in advance, delayed or on time. Then I have added a column called "differences" obtained as such :

differences <- difftime(newdeliveryperformance$order_estimated_delivery_date, newdeliveryperformance$new_orderdelivered_customerdate, units ="days")

this is the end result :

So, if the number is positive it means the delivery had an advance, if the number is negative the delivery had a delay, if the number is equal to zero, it means the delivery was on time.

My question is, how can I create another column that relates the number to a DELAY, ADVANCE OR ON TIME.
I cannot find a way to do it, my idea is to then create a chart with ggplot which relates the delivery performance to the order id, product category, region...

Thank you in advance

I recommend dplyr::case_when for your needs

If you need more specific help, please provide a proper REPRoducible EXample (reprex) illustrating your issue.

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