There are plenty of duties that don’t require heavy lifting…Tesco keep going on about 1 team! Changed the name badges from dept specific to CA, as the thinking is you are expected to cover any dept any time, “where and when required”

is this system in place at your store, that states you are on a certain dept that shift, when you clock in?
The manager is being very reckless on insisting you perform heavy lifting duties before the results of your scan is back

Some of the duties you could do would be :-
Gap scan
Self serve
CSD serving tobacco and lottery
10 items or less checkout
Deli counter, if you still have one open on certain days.
They could also take the opportunity to train you on other procedures in the store e.g.
Wages
Dot com screen systems
Product investigations
PFS to cover for breaks etc..
CSD returns and other procedures they cover
You could shadow a stockie, learn their complex routines, counts and all the different routine usage with the PDA
As usual Tesco are tunnel visioned when it comes to utilising their workforce to the best of their abilities…how often are the colleagues stretched to breaking in their undermanned depts due to holiday or sickness, but can’t get help as no one is trained to do the job!