It’s seriously time to get your holiday shopping done

CNN—Last-minute holiday shoppers may want to give their digital carts a hard look.With colder temperatures potentially delaying shipping, carriers being overwhelmed with orders and some items simply out of stock, there are plenty of risks for procrastinating shoppers. More than half of Americans are worried about deliveries being delayed this holiday season, according to a study in October byBadcredit.org.Extreme weather could create delays for parts of the country. “(For) last-minute shopping, there’s going to be some issues,” said Tyler Roys, senior meteorologist at Accuweather, who noted either snow or rain for most regions.It doesn’t help matters that Amazon workers are on strike on the final weekend before Christmas. Amazon says customers can expect their packages to arrive on time, but logistics experts warn some shipments could face minor delays withthousands of workers on strikesince Thursday in California, Georgia, Illinois and New York.A spokesperson for Amazon told CNN it disputes the reported number of striking workers and said the people picketing outside its facilities are “almost entirely outsiders.” Amazon also said its operations have not been impacted.Most of Amazon’s customers won’t be affected because the company has a high number of facilities,said Satish Jindel, president of ShipMatrix, a software provider that tracks delivery data for package shippers.“They will have the ability to ship product from other locations. They won’t be shut down,” he said. “Some packages that might have taken one day to be delivered will now take two. Some that might have taken two days will take three. But it won’t be that many.”Amazon customers may notice that some items will have an “Arrives before Christmas” message posted to their order.Amazon workers and supporters take part in a strike organized by the Teamsters union at the Amazon facility in the Queens borough of New York City on December 20.Adam Gray/ReutersAmazon said in October that it would hire 250,000 transportation and warehouse workers for the volume of shipping this season asholiday spendingwas expected to increase by as much as 3.5% from last year — a total of $989 billion.As of early December, though, only 10% of consumers reported they were completely done shopping, according to the National Retail Federation. Between the Saturday before Christmas and December 25, about 157.2 million shoppers wereexpected to complete holiday purchases, the NRF estimated.“Whether shoppers have planned out their shopping list or are waiting until the last minute, most shoppers still have purchases left to make before December 25,” said Phil Rist, executive vice president of strategy at Prosper Insights & Analytics, which conducted the NRF December holiday consumer survey.The shorter window between Thanksgiving and Christmas this year could play a role in last-minute shopping. With five fewer days than usual between the two holidays, the NRF estimated the Saturday before Christmas would have more buyers heading to stores and snagging deals onlinethan last year.More shoppers plan to finish their shopping online (49%) than department stores (37%), discount stores (27%), or clothing and accessory stores (25%), according to the NRF.CNN’s Chris Isidore and Erika Tulfo contributed to this report.This story has been updated with additional content.