Greek (SBLGNT): λέγοντες φωνῇ μεγάλῃ· Ἄξιόν ἐστιν τὸ ἀρνίον τὸ ἐσφαγμένον λαβεῖν τὴν δύναμιν καὶ πλοῦτον καὶ σοφίαν καὶ ἰσχὺν καὶ τιμὴν καὶ δόξαν καὶ εὐλογίαν.
NWT 2013: and they were saying with a loud voice: “The Lamb who was slaughtered is worthy to receive the power and riches and wisdom and strength and honor and glory and blessing.”
Fanning and most commentators normally read Rev. 5:12ff as evidence for the deity of Christ. Fanning makes this claim:
"It is christologically significant that ascriptions of praise in Revelation are offered to God alone (4:9, 11; 7:12; 19:1), to God and to the Lamb (5:13), or to Christ alone (1:6; 5:12)."
In footnote 92 on page 228 of his recent commentary, Fanning references Richard Bauckham's observation that John was working with a sensitivity to monotheistic worship when he penned Revelation. Yet Fanning (like Bauckham) thinks Christ is given worship in Rev. 5:12, which would indicate that the Lamb is divine like his Father. But I can appreciate the ascriptions that heavenly creatures give Christ without presuming he is ontologically equal with his Father. That is a point which has been discussed ad nauseam. The thing that intrigues me more is the Hebrew and Septuagintal context for the scene in Revelation 5:12ff.
1 Chronicles 29:11 (LXX): σοί κύριε ἡ μεγαλωσύνη καὶ ἡ δύναμις καὶ τὸ καύχημα καὶ ἡ νίκη καὶ ἡ ἰσχύς ὅτι σὺ πάντων τῶν ἐν τῷ οὐρανῷ καὶ ἐπὶ τῆς γῆς δεσπόζεις ἀπὸ προσώπου σου ταράσσεται πᾶς βασιλεὺς καὶ ἔθνος
There is also Daniel 2:37, which ESV renders: You, O king, the king of kings, to whom the God of heaven has given the kingdom, the power, and the might, and the glory
LXX: σύ βασιλεῦ βασιλεὺς βασιλέων ᾧ ὁ θεὸς τοῦ οὐρανοῦ βασιλείαν ἰσχυρὰν καὶ κραταιὰν καὶ ἔντιμον ἔδωκεν
See Fanning, Buist M. Revelation. Zondervan Exegetical Commentary on the New Testament; Grand Rapids, Mich.: Zondervan, 2020, page 228-229.