Are My Rootstocks Still Viable?

I ordered some MM106 semi-dwarfing apple rootstocks online I intended to take them from the package and plant them immediately. However due to external factors I was unable to plant the rootstocks for approximately 18 days after I received them 
During this time they were sealed in the package which was several layers thick and were kept in a cool place. I've recently taken them from the package and planted them using plenty of water to rehydrate the roots.
They do not have any visible damage and there is no smell of mould. Are these rootstocks still viable?

During this time they were sealed in the package which was several layers thick and were kept in a cool place. I've recently taken them from the package and planted them using plenty of water to rehydrate the roots.
They do not have any visible damage and there is no smell of mould. Are these rootstocks still viable?
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Checked them by scratching two on the bark, both green underneath so that is a good sign
I am but a young sprout at 30 as well, so I have a few years ahead to get the job done. Been at it for about 2 years now and have I'd say 20 apple trees. Would have had more but left grafting too late last year due to work commitments. This year I'm getting it done early tho.
Always had an interest in gardening, but really got into it a few years back, I read the scifi book Dune and that just gave me an appreciation for it making the most of the land we have.