burst pipe under sink

Hi, just wondering if anyone has had experience with a burst pipe water damage under sink. I came home yesterday to water pouring out from presses etc under sink. I managed to get the water switched off but there was loads of water already gone behind the presses and under lino. My plumber came out and reckons the units will be ruined and under lino from the water & will swell and smell! He contacted a loss adjuster who will come tomorrow. Just wondering if insurance will normally cover this kind of damage. To the untrained eye it probably looks kind of ok after tons of towls and mopping up but that's just from the outside. I've never had to make a claim before so wondering do insurance usually just cover a certain amount... or do they send their own assessors out. I think I heard with Covid that they aren't going to homes. Any advice would be appreciated. Thanks in advance... Stress!!