Very unexpected to see Bitcoin jumping above 20k so quickly. But of course, I won't complain, I'm not a bear. 
Block numbers are increasing already and I'll also contribute my calculations based on current numbers and how it would look like if we'll find 1 Block each 10 min from now on:

Time left until January 31, 2023, 23.59h:
12 days

On average, each day will be mined (1 Block per 10 minutes) 144 Blocks per day (6 Blocks per hour x 24 hours = 144 Blocks)

Calculation if we won't see any hashrate change:
12 days * 144 Blocks per day = 1.728 Blocks

=>

1.728 + 772.748 (current Block) = 774.476

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And keep in mind: if Bitcoin's price doesn't increase further, we'll get a similar Block number from our current 10-min calculation because most likely, the hashrate won't be changed much.