How to show that in Delivery time filters you can select one option

in the mobile site i have delivery filters with a list of options the user can choose from , the options functions as radio button. but once the user select one of the options the selected options will be checked (as you can see in the attached image).

the thing here is that the user can't check and unchecked the option that he have selected because this is a radio button. he can only choose another option from the list.

my concern is how to give the user the indication that he can't check and uncheck this option ? although he can do it on other filters like color for example.

• changing the icon from check mark (✓) to (.) built will help?