Ocado in the UK do exactly this, using queue-it [0]. On some sites, apparently queue-jumping is as simple as disabling javascript (n.b. Ocado [1] have been in

Ocado in the UK do exactly this, using queue-it [0]. On some sites, apparently queue-jumping is as simple as disabling javascript (n.b. Ocado [1] have been in the game longer than most, and this does not work on their site). [0] https://queue-it.com/ https://queue-it.com/ [1] https://ocado.queue-it.net/ https://ocado.queue-it.net/