Dic/ most as an adverb meaning almost

1. [US and Canadian informal or dialect] almost

2. Although considered by some to be unacceptable in all cases, most is often used to mean "almost" in both spoken and, to a lesser extent, written English to modify the adjectives all, every, and any; the pronouns all, everyone, everything, everybody, anyone, anything, and anybody; and the adverbs everywhere, anywhere, and always. Other uses of this sense of most are dialectal.

3. [AmE informal] almost

• most every town in this state.
• we'll be crossing the river most any time now.
• Most everyone agrees.
• You can use most any measure when you're speaking of success.

...... Collins; https://www.merriam-webster.com/dictionary/most; LDOCE; American Heritage; ...