Samsung has started rolling out the November 2019 security patch to the Galaxy Note 10 and Note 10+. The update is currently rolling out in Switzerland, which will soon be available to more regions.
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The software version of this update is N970FXXS1ASJG and N975FXXS1ASJG for the Galaxy Note 10 and Note 10+ respectively. The size of this update is 140MB.
If you want to check for the update manually, just head into the Settings > Software update > Download and install.