so you pre-order some tyres that the vendor quite clearly states on their website
“The tyres are on their way from Germany and are due to arrive 10th January”
It gets to the 10th january and you expect them to be with you the next day ‘or so’, despite there probably being a large number of people that pre-ordered and therefore a large number of orders to be picked and sent out
I would say chances are you will be fitting the tyres after you do the rest of your work, but you cant really blame On One, Royal Mail, or the German postal equivalent as it was clearly stated that the earliest possible date for them to be in One Ones warehouse (not your house) was today!